I am running Firefox 4.0.1 in Xubuntu 10.04 Linux OS. Using XFCE GUI.
.exe files don’t execute.
I guess there are more secure systems, but this is simple and it works and is free of all Windows viruses/trojans.
There are threats to Linux machines, mostly root kits. But it is much less likely to pick up slimeware and viruses.
Have used Linux for over 10 years and never had a virus or slimeware.
I have one of my computers running the same set up. Works really well. The one I use for just surfing only is running IE
Been running windows for 10 years and never had a virus.