Just a few of the problems you may encounter after installing SP2
The best way to describe SP2 is it's a new operating system
You may need to reinstall drivers and software after an upgrade.
"Windows XP compatible" and "Windows XP SP2 compatible" are 2 different things.
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"something the average user would not understand how to fix"
Installation of Microsoft Windows* XP Service Pack 2 (SP2) on systems using Intel® Desktop Processors
For a successful installation of Microsoft* Windows* XP Service Pack 2 (SP2) on systems using Intel® Pentium® 4 or Intel® Celeron® D processors, Intel recommends a check of the system BIOS to ensure that it is a BIOS with Intel production support for the installed processor. Using a BIOS that does not support the matching processor may cause the system to hang on the first reboot during installation of Microsoft Windows XP SP2.
If a system hangs it could be due to a BIOS that did not have Intel production support for the installed processor. In this event, you should contact your system or motherboard manufacturer or your place of purchase to obtain a stand-alone boot procedure to install the matching BIOS for your processor so Microsoft Windows XP SP2 can resume installation.
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Windows XP release notes (problems you may have after xp sp2 upgrade)
http://support.microsoft.com/?kbid=835935
At the bottom of this article are programs that will need ports opened in windows firewall to work correctly
http://support.microsoft.com/default...b;en-us;842242
Programs that are known to experience a loss of functionality when they run on a Windows XP Service Pack 2-based computer
http://support.microsoft.com/default...t=windowsxpsp2
Internet Explorer problems
http://support.microsoft.com/default...t=windowsxpsp2
Another thing i forgot to mention.
Don't install windows XP SP2 to repair a system that isn't working properly
I've seen alot of posts where people have written about system slowdown software not working and devices not working properly
To suggest upgrading to SP2 to resolve these problems is ridiculous, SP2 is not a repair tool
If you have a virus and it's not cleaned prior to updating to SP2
you will still have a virus
If you have spyware on your computer and upgrade to SP2 not only will you still have spyware but you will have a bunch of errors because SP2's firewall is installed active by default
If you have devices and software not working properly SP2 won't fix these either
Fix your problems before upgrading or do a clean install of XP and upgrade to SP2 before doing anything else.