>>>Microsoft Security Essentials gets my vote. I wrote a blog post on it:
>>>
>>>http://blog.auctionflex.com/?p=188
>>
>>Our computer came with Notron installed and I don't know how to uninstall it.
>
>Run its uninstaller from Add/Remove Programs. Then download the appropriate version of the Norton Removal Tool to remove all traces.

Isn't it nice that Norton infects your system just like what you think it is there to protect against? Then you have to get a tool to remove it just like any other virus.