Doa is once again quite right.
However if it were me I would uninstal the Google toolbar (and Google desktop search as well – if you have it). Remember there’s no such thing as a free lunch….. and they are known to ”call home” so as to ”tailor” your web browsing experience based on what they ”see” on your computer.
The pop-ups etc are initiated by a bit of spyware / malware on your computer which you could have picked up pretty much anywhere – even as a ‘drive-by’ download or maybe buried inside a downloaded file (like an MP3 music file for example).
An ectremely good Utility for removing spyware/malware is called ‘Spyware Doctor’ It isn’t free but you can get it from here >>>> http://www.pctools.com/spyware-doctor/?ref=afl_nenextech
Not only is is a first class removal tool – but it also runs in the background and proactively defends your computer against future highjackers/spyware/malware.
WARNING …. if you are running ‘Kaspersky’ firewall or anti-virus, you can’t use Spyware Doctor as they clash.