Unofficial Windows 98 SE Service Pack is an updater for the Windows98 Second Edition operating system which contains all the updates, patches and hot-fixes from Windows Updates websites plus a few more features. The freeware Service Park for Windows 98 SE (now at version 2.1a) contains all necessary and required fixes and updates for Windows98 SE system only, and does not contain Internet Explorer 6, DirectX 9, Media Player 9 and related updates. So it makes the life easier for Windows 98 SE users.

Some features in Unofficial Windows 98 SE Service Park 2.1a:

# 120+ updates and hotfixes.
# Solves 512 MB of RAM problem.
# 256-color tray icons.
# Better Notepad: MetaPad 3.5 (Optional).
# Optimized swap file usage (Optional).
# Better WDM and USB support.
# Adaptec ASPI 4.60.1021 drivers (Optional).
# Windows Scripting Host 5.6.
# DCOM98 1.3.
# OLE Automation Libraries 2.40.4522.
# Dial-Up Networking 1.4.
# Microsoft Installer 2.0.
# HTML Help 5.0.
# TweakUI (Optional).
# Command Prompt Here (Optional).
# New Animated Boot and Shutdown Logo (Optional).
# Microsoft Layer for Unicode.
# Visual Basic 5.0 SP2 runtime library.
# Visual Basic 6.0 SP6 runtime library.
# Visual C++ 6.0 SP6 runtime libraries.
# Updates JET 3.5 files to JET 3.5 SP3.
# Supports 98lite 4.7.
# Windows 2000/ME desktop icons.
# Windows 2000 color scheme (Optional).
# Supports custom “Program Files” directory.
# Shows attributes column in details view on the Windows Explorer.
# Semi-slipstreaming support.
# Some tweaks (Optional).

Unofficial Windows 98 Second Edition Service Park can be downloaded here. It can be uninstalled too, albeit is not a clean uninstall and not recommended unless there are serious problem.