If you do a complete install, then the answer is yes! However, I think if you do a "repair" they will be OK? Best bet is to copy all that you want to keep on to a CD or DVD then do a complete fresh install.
Thanks Press Man. I'm not sure if I should do a complete reinstall or repair. An error message keeps appearing when I go on the start menu to open a program: "Microsoft explorer has encountered a problem and needs to close...blah blah blah". The screen then refreshes back to the desktop. Any suggestions?
If you get stuck theres no harm trying a repair click here but read the post carefully as if you screw things up you will end up losing all info on your PC. Hence Press Mans advice to backup just in case is a good one.
WinXP repair install then you will not be able to install the updates - these are lost by the repair process. You will need to register the Wups2.dll file, which is currently used by Windows Update and remains on your computer after the repair. Full instructions can be found at http.//support.microsoft.com/kb/943144 TC.