Hello GrayPlayer, before reinstalling uninstall any other third party antivirus or antispyware applications if present. Then try the One Care virus and spyware repair tool - http://social.microsoft.com/Forums/en-US/onecareanti-virus/thread/0c3905ab-672e-41c4-9be8-8f0f1636f123
If the repair tool does not resolve the issue uninstall One Care, run the install cleanup tool - http://social.microsoft.com/Forums/en-US/onecareinstallandactivate/thread/399071e2-49dc-4767-932d-d261e3965943 then install One Care. If the issue persists please contact support. How to reach support - http://social.microsoft.com/Forums/en-US/onecareinstallandactivate/thread/30400b52-7f26-4ba0-bc18-17e305329d90
Try to check whether Onecare Antivirus works in Clean boot or not.
Here is the link to Clean Boot.
http://support.microsoft.com/default.aspx/kb/310353