Windows 98SE Updates & Unofficial Service Packs


It's the Latest service pack for Windows 98 Second Edition (W98SE).
It can be found here:
U98SEPS - Unofficial Windows 98SE Service Pack Updates
These updates are created and provided by Problemchyld, who is now in charge of this project.


Unofficial Service Pack 3 beta 4 by Gape (aka uSP3-b4).
It was the latest stable version of the service pack for Windows 98SE before U98SESP3.EXE.
This version can be installed if you have serious problems using U98SESP3.EXE
To download this service pack click here: sesp30b4-en.exe
infos on this pack here: sesp30b4-en.txt

If you install this pack, you may want to download and install other updates and patches released after the last version of the safe and tested Unofficial Service Pack 3-b4.
You will find them on this page:
Windows 98SE Updates Post Unofficial Service Pack 3-b4

The author and owner of this website as well as the owner of the server hosting this website and all the persons having been involved in the creation or the distribution of the files, updates and executables present on this website will not be responsible for any material damage, loss of hardware performance or functionality, alteration or loss of datas, theft of datas, exposure of classified documents, loss of privacy, penalty, material or financial depreciation or loss or liability or any other loss or damage or liability of any kind caused by the use or inability to use these files, updates or executables.

They are delivered to You for free, as is and without any warranty attached beyond those already described in the agreements between You and their authors or vendors if any. You understand that most of them doesn't come with any warranty at all and that there is no garantee that they will work on your computer as advertised.
Moreover you agree to use each of them with respect to the user agreement provided by their author if any.

Use at you own risk.

More specificaly, You understand that the author and the other persons who participate in its creation, promote, advice to use, or distribute any of the Unofficial Windows 98SE service packs (refered hereafter as U98SESPs) also, but not exclusively, delivered as "sesp30b4-en.exe" or "U98SESP3.EXE" or any other denomination used for translated versions or other versions, as well as Microsoft Corporation or any other party directly or indirectly concerned will not be liable for any damage, loss of software or hardware functionality or performance, loss of datas, loss of time, loss of money or any loss or liability of any kind caused by the use or inability to use the U98SESPs.

You understand that U98SESPs are not products of Microsoft Corporation and not products of a commercial company, that's they are developed and distributed as is, benevolently, unofficialy (althought legaly) and freely without any guarantee attached, without any promise of support, that there is no guarantee whatsoever that they will work as advertised and that you use them at your own risk and in full consciouseness of the risks attached to an unofficial service pack for an operating system.

Before installing one of the U98SESPs You are supposed to have made all the necessary steps to saveguard your datas and be able to reinstall an operating system as described in, but no exclusively the important notice above and to have the technical knowledge and ability to fix computer related problems in the case one of the U98SESPs will prevent your computer to work properly.
These necessary steps consist in, but no exclusively:
- Having the original w98SE installation disc
- Makiing a back up of all important datas
- Making a back up of the system files
- Having a back up of the registry

Before, during and after the installation you are supposed to read CAREFULY all the instructions you get through dialog box messages, dos prompt messages or otherwise.
You are also supposed to understand these instructions and have the appropriate knowledge to act accordingly and to select the appropriate options if any.

All the U98SESPs and all other versions or translations of it are distributed for free, without any profit for the author(s) and for the distributors.
The U98SESPs cannot be distributed in exchange for money or any other liability.
You have the right to distribute all of the U98SESPs to the legaly binding conditions that you do not charge any amount of money or make any profit directly or indirectly, that you distribute an unmodified version and always the latest version available on this website or from the author's website if any.

Help and Discussions on MSFN forums

Discuss the unofficial Service Pack 3 here:
98 SE SP 3.0 BETA

Discuss issues with one of the specific update:
Internet Explorer 6.0SP1 update (MDIE6CU.EXE by Maximus Decim) link
Native USB Drivers update (NUSB.EXE by Maximus Decim) link
Data Access Component update (Mddacu.exe by Maximus Decim) link
RICHED20.DLL compatibility (RICHED9X.EXE) link
FDISK and FORMAT on large HDDs ( link
Macromedia Shockwave Player (flash_player_9-0-260_active_x.exe) link
Windows Image Acquisition (WIA11.exe) link
Root certificate (rootsupd.exe) link

Discuss specific issues with W98(FE-SE):
Installing W98 on Large Hard Disk Drives, over 137 Gb and More than 1Gb of Ram link
Installing W98 with more than 512 Mb of Ram link
Using more than 1Gb of Ram link
Using large Hard Disk Drives, over 137 Gb link
Using large USB Hard Disk Drives link
Reformating USB Hard Disk Drives from NTSF to FAT32 link
Compatible Hardwares link
Compatible Softwares link
Compatible Motherboards link
SATA drivers installation issue link
SATA drivers (Good/Bad?) link
SATA to IDE adapter link
PCI/IDE controler chip link
NVidia driver link
ATI driver link
Graphic Cards, which are the best? link
Multi Card Reader Driver (photo camera and so on) link
Optical Mouse link
Creative Sound Blaster Live drivers link
Can't find a driver? link
Windows 9x/Me Security Thread for 2011 link
Antivirus support link
ClamWin link
Avast link
Kapersky link
GDI Heap Extender (beta) link
Gaming Guide link
Xbox360 Controller link
Asus Eee PC link
The IPV6 issue link
Networking 95 or 98 & Vista link
Wireless connectivity link
Wired Routers, Ethernet link
Javascript Tweak (faster internet experience) link
TCP/IP limitation (Transmission Control Protocol/Internet Protocol) link
Adobe Flash PLayer 10 (with Kernel Ex) link
USB2 chips link
Bluetooth link
FireFox 3.x (FF) link
FireFox 4.x (FF) link
FireFox 5.x (FF) link
FireFox 7.x (FF) link
FireFox 8.x (FF) link
Opera 10 link
Opera 11 - Fonts Problem link
Opera discontinued support link
K-Meleon link
uTorrent link
Spybot S&D link
YouTube link
Google Street View link
Media Player Classic link
VLC link
Acrobat PDF Reader link
Not Enough Memory Error link
Freezing Problems link
Swap File Size link
Bitmap (picture) size limitation in clipboard link
High Resolution in Safe Mode link
More than 1 GiB in Safe Mode link
System Restore (alternatives) link
Dual Boot W98/XP link
Dual Boot W98/Vista link
Running win98 off a CD link
Removing IE link
NTSF support link
Sharing files between W98 and XP link
Multicore processors link
Transparency link
Taskbar Grouping link

Existential questions:
How to properly install all those patches/updates? link
What Uptdate/Upgrade to use? link
The complete list of hotfixes & updates link
How to obtain M$ hotfixes? link
Is Windows 95/98 Free? link

See and discuss other updates/packs/updaters not included on this page:
The KernelEx project link
The KernelEx App Compatibility Database link
WUPG98 Afterlife Edition link
W98SE2ME Killer Replacements link
Windows 98 Live CD link
Revolution Pack link
Autopatcher for W98SE link
Maximus Decim Cumulative Update link
Windows Media Player 10 on W98 link
Windows Media Player 10 + XP SP3 Killer Replacements link
Driver Pack for W95/98(FE-SE)/ME link
W98SE Immolator link
USB2.0 stack (preliminary test version) link
Mindows project link
Big Open Box link
Patched IO.SYS link

See and discuss also useful tools designed especialy for W98:
Tihy's tools link
Installed (System) Files Checker.hta link
Context Menu Customizer.hta link

See and discuss service packs for Windows version prior 98SE or for windows ME:
Service Pack for windows ME link
Unofficial W95 OSR2.x Service Pack 1.0x link
Usb Storage Driver pack for Windows 95 link
W95 2.1GHz CPU Limit BROKEN! link
Shell 95 Update Project link
Service Pack for W98 Standard (First, Gold) link

See and discuss issues related to DOS and DOS mode:
DOS programs and drivers link
Install DOS USB Drivers link
Read CD-R/DVD in DOS mode link
Free DOS link

See and discuss also:
W98 developer team link
Windows 98 DDK + Documentation link
W98 Still Alive Campaign link
Windows 98SE in 2009 (article and videos) link

Write a comment, make a suggestion or ask any question about this page in particular here:
The Post uSP3 Updates Depository Webpage

Write a comment, make a suggestion or discuss about MDGx's Windows98+ME Updates page:
Windows 98, 98 SP1, 98 SE + ME Updates, Patches + (Hot)Fixes

Discuss any issue with Windows 95/98(FE,SE)/ME not listed above here:
W98SE Tips & Techniques
The Windows 95/98/98SE/ME Forum

Other W95/98(FE-SE)/ME related links outside the MSFN forum:
ERPMan's Windows 9x & ME Services Packs, Patches, Addons & Updates Page
MDGx's Windows 98 + ME •still• alive Campaign
... and more to be added in the future.


See also on this website: HTAsoft's homepage
Maxthon Plugins  and  Installed Files Checker  and BigOpenBox for w98  and Aviutl's tutorial