Sounds like you have been zapped by a hijacker which has changed you home page to one which has lots and lots of pop-ups associated with it.
The first thing to do is to try setting your home page to 'Blank'. This should enable you to browse to your desired homepage and set it to default.
Do this in Internet Options before going online.
Lots of ways to get there but try Intenet Settings in the Control Panel first.
After that you need to get some spyware/malware protection such as Spybot S&D - Adaware - A-Squared etc. and run the scans. Delete all the resulting files and then try browsing again.
Be very careful which sites you visit.