Use windows-update to find out what critical updates you need. Then download them the normal way from Microsoft, and run them.
This is the site for Windows 98: http://www.microsoft.com/windows98/downloads/corporate.asp
IE security patches can be obtained from download.microsoft.com
Hope this helps.
(Windows 98 Second Edition 4.10.2222 A)
Every time I try to update either Windows or Internet Explorer I get as far as "100%" and then a crash, with the message:
"Microsoft Internet Explorer has encountered a problem and needs to close. We are sorry for the inconvenience."
AppName: iexplore.exe AppVer: 6.0.2800.1106 ModName: winspool.drv
ModVer: 126.96.36.1998 Offset: 000016c3
I have tried the recommended remedies, i.e. remove anti-virus software, include the WinMe version spoolss.dll, but to no avail. I have had a similar problem recently with print queuing but rectified that with the software removal.