This is can be caused by conflicting software or malware infection. If you have other antimalware programs on your computer uninstall them and run an uninstall/cleanup tool for any previously uninstalled antimalware programs -http://social.answers.microsoft.com/Forums/en-US/msestart/thread/407bf6da-c05d-4546-8788-0aa4c25a1f91
If that does not resolve the problem you can start here:
https://consumersecuritysupport.microsoft.com/ or here:
http://support.microsoft.com/contactus/cu_sc_virsec_master?ws=support#tab0 for help and support for malware infections.
If you are in North America, you can call 866-727-2338 for free help from Microsoft for virus and spyware infections.
In other regions not served by the link above, go here:
http://support.microsoft.com/security and go to the “assisted support” or contact us menu.
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