Try this, click Start > Run and type regsvr32 urlmon.dll and then hit enter or click ok. You should get a message that DllRegisterServer in urlmon.dll succeeded, click ok and see if that helps. If not then boot from xp pro cdrom after it loads files at prompt hit enter to install xp, then at next prompt hit f8 to accept the license agreement and then press r to repair selected xp installation at the last prompt. This will repair all portion of windows istall and leave in tact your drivers, settings and software. One of this 2 will most likely solve this issue.