Personally, I would choose ESET NOD32/SmartSecurity. I have been using it for 10+ years and NEVER had a nasty get through on systems ranging from DOS6.22 through to Win7. There are versions available for a number of Linux distros (with more in beta) and even a Mac version in Beta. There is support for Mobile smartphones too with WinMobile 5 --> 6.5 support now with Symbian due iminently (in public beta now). In fact, I like the software and trust it so much that I have even become a reseller and partner. More info can be found at http://www.mrt502.co.uk/eset.aspx Yours, MRT502