Hi, Please try system file checker and disk check. Open an elevated commend prompt window, type: sfc /scannow chkdsk c: /f /r Meanwhile, the issue is related to Microsoft Security Essential, you can post in: http://answers.microsoft.com/en-us/protect Niki TechNet Subscriber Support If you are TechNet Subscription user and have any feedback on our support quality, please send your feedback here. Niki Han TechNet Community Support

Thanks Han, By doing the scannow I was able resolve the issue

I am scanning my computer with Microsoft Security Essentials, it always stuck at C:\windows\system32\codeintegrity\driver.st. does any one know how to fix this issue. Thanks

Try performing a disk integrity check: go to Start -> All Programs -> Accessories -> Command prompt, right click on Command prompt and click run as Administrator; in the Command prompt window execute the following command chkdsk /f /r Wait fot the end of the check and try performing the scan again. Bye.Luigi Bruno - Microsoft Community Contributor 2011 Award

Hi, Please try system file checker and disk check. Open an elevated commend prompt window, type: sfc /scannow chkdsk c: /f /r Meanwhile, the issue is related to Microsoft Security Essential, you can post in: http://answers.microsoft.com/en-us/protect Niki TechNet Subscriber Support If you are TechNet Subscription user and have any feedback on our support quality, please send your feedback here. Niki Han TechNet Community Support