this is one I would try if I didn't have my pd zone alarm.

http://download.cnet.com/Comodo-Inte...html?tag=mncol

It may bog down on a older machine though, but if a newer machine it should be fine.
{If Norton didn't bog it down you should be fine.}

and some others to look at-
http://download.cnet.com/1770-2023_4...dows&tag=ltcol

I tried about 5 of the top rated internet suites and liked Zone alarm the best , but you might like another layout or style , but install /try it and if you don't like it remove it and try another.
That's the best way to find one you really like, and to make sure it isn't slowing down you machine too much.