In addition, you can install Sandboxie that puts your browser in a sandbox without bothering you.
While you are surfing on the internet, each bad object (and good object), caused by surfing, clicking or downloading, will be stored in a sandbox and won't hurt your system, unless you decide to keep it.
Keep in mind that internet is a dangerous area, full of traps and the main cause of all infections and troubles, so this is a pretty good protection. Sandboxie doesn't recognize virus/malware like a scanner, it only "isolates" good and bad objects in a sandbox as a potential danger, that's the philosophy.
The free version of Sandboxie is only comfortable if you use Internet Explorer as browser and has also less functions. If you don't like it get rid of it, at least you tried something new to protect your computer.
http://www.sandboxie.com/