Evening
Its probably something really easy like
http://www.thinkwiki.org/wiki/BIOS_Upgrade_Downloads
Have you updated your bios to the latest version?
AD1881a audio cound controler update? Can cause problems with Sp3. Not being the latest version.
Prior to installing Sp3 did you have it pluged in?
Checked the memory sticks with microsofts memory tester?
Did you look at your chipset and see if there are any new ones from
What about the ethernet adaptor card?
Unforetunately looks like suport may have been discontinued for your video card on board.
Try here
http://forums.lenovo.com/lnv/board/message?board.id=Legacy_Thinkpads&thread.id=158
http://www.driverheaven.net/windows-xp-2k-radeon-display-drivers/118093-dh-mod-tool-v4-released.html
Have you requested a beta driver if possible from ati.amd.com?
You have an ati mobility radeon 7800. It might be possible to figure out what is generating your error by downloading the process monitor or process explorer from sysinternals.
Have you recently removed any programs from your thinkpad?
Are you docking to a home network?