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Hi, Your question does not contain all the required information needed for us to help you. Please provide us with the following information.1. Do you get any error message?2. What changes were made on the computer before you encountered the issue? I would suggest you to follow the methods listed below to resolve the issue:Method 1:a. Start the computer in Safe Mode and check if the issue still persists. Please refer to the below mentioned link to start the computer in safe mode:http://support.microsoft.com/kb/315222b. If the issue does not persist in safe mode, continue with clean boot to find the issue causing item. Please follow the steps mentioned below to perform clean boot:http://support.microsoft.com/kb/310353Method 2:You might also like to perform an online scan of the computer. Refer to the link mentioned below to perform an online scan of the computer:http://onecare.live.com/site/en-us/default.htm Regards,GauravPrakash - Microsoft SupportVisit our Microsoft Answers Feedback Forum and let us know what you think.