Thanks Firefox, some useful links for all of us there, and also a warning about staying away from the murkier areas of the web
If you're using Hacker sites, stay safe and use some firewall protection too, this can also stop some popups, and some of the adware/spyware phoning home to report back.
http://www.zonelabs.com offers their firewall (zonealarm) in a free version.
And Antivirus software, if you don't have any, is free at
http://www.grisoft.com for AVG antivirus, and includes free regular updates and works very well.