Try the following solutions :
Scan your Hard-Disk for errors >> Go in the Start Menu, Program Files, Accessories, System Tools, Scan Disk.
Defrag your Hard-Disk >> Go in the Start Menu, Program Files, Accessories, System Tools, Defrag.
Scan your computer for viruses >> Go to
this site and scan your hard-disk for any viruses.
Repair the Windows installation >> Go in the Start Menu, Program Files, Accessories, System Tools, System Information. Try the different options in the "Tools" menu.
Try these steps in order, trying to patch the game after each one. Make sure you scan and defrag your hard-disk before trying to patch.