1.Delete all files and folders with dates older than one week from  C:\WINDOWS\TEMP.

2.Run ScanDisk (Start/Programs/Accessories/System Tools) with the Standard radio  button selected and the Automatically Fix Errors option enabled. Click on the Advanced button, and under Log File pick the Replace Log option; for Cross-linked Files, select Delete; click Free under the Lost File Fragments heading; check the option labeled "Invalid dates and times" under Check Files For, and disable the "Check host drive first" option, unless you've compressed your hard drive.

3.Empty the Recycle Bin.

4.Run Disk Defragmenter.