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No problem. :)

PCMark is quite a good tool - it comes with a free trial.

Here is a list of good tools:

http://www.pctechbytes.com/computer/article-51.html

I got McAffee Internet Security free with my Sky subscription, so I'm sorted for the moment. I use NOD32 on my laptop though, and that is an excellent program.

Loads of people use AVG, as it is...