I chucked the Norton I bought in favour of the Free AVG. AVG, leaps and bounds better.
1) Faster scans and doesn't tax the system as much as Norton.
2) Updates daily
3) much higher % of finding and stopping trojans,viruses etc..Norton in my experience didn't stop many malicious software.
Get AVG Anti-Spyware and Anti-Virus, both are free and don't have evaluation period use only.
SpySweeper also good but only 14 days free evaluation period.I'll pop over to Best-Buy and get it soon.
CounterSpy ,has a free trial version.Just found and deleted a KeyLogger.
Ad-Aware, Free unlimited.
Crap Cleaner, deletes unused files, extensions
etc..Free unlimited.
SpyBot S&D, good.Free unlimited.
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Oh and turn off 'Remote Registry'.
Control Panel\Administrative Tools\Services
Find Remote registry in the list and right click then choose disable.
Below quote is from Microsoft explaining what happens when you turn it off.
"Enables remote users to modify registry setting on this computer.If this service is stopped, the registry can only be modified by users on thsi computer.If this service is stopped, any services that explicity depend on it will fail to start."
I read about turning this off from an internet security website.Have never had a problem due to turning it off.