Restart the computer into "Safe Mode" using the instructions below:
Restart the computer, pressing the F8 key once per second, till it loads a selection screen. Use the up and down arrows to select "Safe Mode", press enter, and the computer will load into a safe mode. It looks like a normal screen but with Safe Mode in each of the four corners. The various drivers don't work in Safe Mode but it allows you to Scandisk and Defrag. When you?re done, restart the machine and it will boot normally.
At this time run Scandisk and Defrag to correct and align the file system to its optimum. Do the Scandisk first, then the Defrag. After opening Scandisk, place a CHECK mark in ?Automatically Fix Errors. Click on the "Advanced" button, then make sure the settings look like this:
Display Summary=Always
Log File=Replace Log
Cross-linked File=Delete
Lost File Fragments=Free
Check Valid Files For=Place a check in ALL of the options
Check Host Drive First
If it finishes, and if it indicates "Errors were found", then restart the computer into "Safe Mode" again, then run Scandisk again. When Scandisk runs without Errors, then run "Disk Defragmenter" while in "Safe Mode" also.
Hope this helps.
Grif