Provide us more information on the issue:
·Do you receive this error message during the startup process?
·Or do you receive this error message when working with any application or program?
·Do you have security software installed on your computer?
·What is the service pack installed?
Run virus scan to make sure there is no virus or malware activity on your computer. You may refer the below link for online virus scan: http://onecare.live.com/site/en-us/default.htm