The next area to check would be the hard drive for errors
1.Open Computer by clicking the Start button , and then clicking Computer.
2.Right-click the hard disk drive that you want to check (C), and then click Properties.
3.Click the Tools tab, and then, under Error-checking, click Check Now. If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
To check for both file errors and physical errors, select both Automatically fix file system errors and Scan for and attempt recovery of bad sectors.
4.Click Start.
5.You will be prompted to reschedule the disk check for the next time you restart your computer. OK that and reboot