Computer is slow?

i got a fast computer but it going slow, it gets popups of naked girls all the time and my explorer wont work and there is a yellow icon on the taskbar that says my computer is infected with a virus, and i got another icon, its a ball with spikes on it and it links me to a porn site, and i cant have any viruses at all because i have AVG Free Antivirus and it has never told me i have a virus????? so do i need a new computer or should i install vista i heard it is impossible to get viruses with vista

Computer is slow?internet

Vista can get infected just like any operating system. It sounds like you have been infected with spyware trojans.

As the biggest of the problems seem to be associated with Spyware, for starters, download, update and run a full scan using the following product:

http://www.superantispyware.com/

SuperAntiSpyware is exceptional and will remove the majority of difficult Trojans and Worms, not just the easy ones.

If possible it is recommended that you load the application in normal mode but run it in Safe Mode. Safe Mode can be started by continually pressing F8 during the boot sequence. If you are badly infected you might need to run SuperAntiSpyware more than once to help clean your system. If the only infections now being shown are in System Restore, once you are completely satisfied that you can boot normally, you can either delete the infected restore points manually, or temporarily turn off System Restore.