Whilst I do agree that you are being very cautious with the sites that you visit and of course taking care with all email attachments (and of course not clicking on links in junk emails), have you thought that perhaps the reason you are not getting any problems is (and this is only a thought) but if you are using a wireless router, this in itself may be heavily firewalled. The reason I say this, is that I tried that very test. At one point my wireless router packed in, so I had to use my old SAGEM tiscali modem, which was a direct usb connection, and no firewall of any kind. Within half an hour, quite a few files appeared on the c drive, and when I did a search of the C drive using "Files Created Today", at least 5 new ones appeared in System32 with very suspicios filenames, eg xyxyyxfffs.exe or dgfgfgfgf.dll Having said that, I imagine it is more as you say, that you are perhaps using a wireless router with built in protection, aswell as of course regular microsoft updates, which does indeed prove that perhaps you can save the high prices demanded by some of the anti virus and firewall software companies, especially Kapersky, which is very over priced compared to Norton. By the way PANDA make antivirus and firewall software, excellent value and excellent product.