Previously detected Antivirus software suddenly not detected

I am running Windows Vista Home Premium SP2 and I have Webroot SpySweeper with AntiVirus installed. Detected Security Center program as soon as I installed it, but a week ago, he suddenly stopped to detect. Under Malware Protection now, it says "Windows has no find antivirus software on this computer." Of course, it continues to remind me of this fact even if the program runs normally and regularly updated. y at - it a way to get the Security Center to detect again? I don't want to put an end to the control of my computer for antivirus software.

I went through the sections of Microsoft support, and I've not found anything. I am also an advanced user.

Thanks for your help.

Uninstall and re - install Webroot SpySweeper with AntiVirus could fix.
Boulder computer Maven
Most Microsoft Valuable Professional

Tags: Windows

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