DataExcecutionPrevention

"DEP" is not a strange issue,it happens when viruses and other security threats attacks our O.S. by executing malicious code from memory locations that only Windows and other programs use.

Step 1:
If you want to turn on "DEP" for only certain programs,then follow this My Computer(RightClick) >> Properties >> Go to Advanced Tab >> Click on Performance >> click on settings >> Select "DataExcecutionPrevention" tab and mark the second check box.By default the box looks like the "Performance Options" picture shown above.

Step 2:

If you want to disable this error message (to turn off DEP) first do the step 1 and open "boot.ini" and modify like this,

"multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /fastdetect /NoExecute=AlwaysOff