Actually, the info the OP provided is at least sufficient enough to suggest a repair-install first.
CAZ12248:
If you have Internet Explorer 7, Service Pack 3, or Windows Media Player 11 installed on your PC, then you'll need to slipstream those into your Windows XP source files first using nLite:
http://www.nliteos.comUse the disc created through nLite to do your repair-install.