I am running an HP laptop with Vista Home Basic 32-bit. About a month back, I had a JS/Downloader.Agent Threat detected by AVG, something for which I took advice from here from Mr.Howard. During the same clean up process and ever since, My security center stopped working. I kept getting a notification that My security center is switched off, and all attempts at trying to switch it back on were met with an error stating that " THE SECURITY SERVICE CANNOT BE STARTED" Although now the VIRUS threat no longer exists(Thanks to HOWARD), the security center notification doesn't stop popping up. Can you please help me out with this.