ahhhh sounds like u have an adware problem n possible trojan attacks, u'll need adware checker theres a free one at this link:
http://www.download.com/Ad-Aware-SE-...bj=dl&tag=top5
& or
spyware checker free scan
http://www.nuker.com/info/01.php
And a antivirus checker free scans highly recommended
http://housecall.trendmicro.com