Norton Security Scan

Hi,
I am uncertain how this program downloaded itself to my P.C. but man what a pain. I currently run McAfee Antivirus and have for years, I have never liked the Norton Product. Somehow, this program downloaded to my machine and installed itself. I have used the windows uninstaller to get rid of it, but on reboot, it seems to re-install. I have used Iolo System Mechanic to get rid of it, but again, on reboot, it re-installs. I un-installed it today, found the reference in my registry and removed the install program directly from the registry. I also wipeed out the directory  that the registry said it was in, then rebooted. You guessed it... here it is again. When I came back to my P.C. not only had it re-installed, but it was running. Doing what I find Norton to do it's best.... slowing my system down. I bet I have tried to uninstall it 5 times in the last week. I am uncertain which program I downloaded that set it up but I am tired of it. Today, when it was running and I tried to stop it it asked me if I wanted to buy it. Is Symantec really this desparate to sell a product? The product does not have a version associated with it on the startup screen.

I had found a thread that menioned downloading a removal program directly from Symantec, I took the link but the download, which they claim to be specific/product was not there for Norton Security Scan.

So, I give up. Can someone assist me to get rid of it permanently.

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