Spyware Help URGENT and Yahoo Toolbar?

I need desperate help, I think I might have a form of spyware/adware/malware.

It's when your on a site and it's forwarding me to another site.. it's that annoying i'm typing this on wordpad and will copy and paste onto yahoo answers.

I had installed already: AVG, Windows Defender

But after finding this I installed Spybot, SuperANTIspywere and Commodo from my old PC which is Virus/Spyware free

I need help in getting rid of it

I'm performing scans and it's getting rid of the odd 2 things but next time i'm on the internet... it's back

My pc's very slow aswell..

I don't want to download another thing as I've head some contain spyware themselves!

If you know of any online scans that would be great, I've tried Panda but my laptops Vista and won't run it..

Oh, and I have the Yahoo toolbar downloaded brand new from yesterday and I can't find the anti-virus on that.. I've looked on show/add buttons and it's not there..

Please Help! :(

Spyware Help URGENT and Yahoo Toolbar?virus removal

Here a good free online scan:

http://www.bitdefender.com/scan8/ie.html

The reason it come back - you do a scan %26 its removes it; you then turn the PC off when you turn it back on system restore restores what you have removed, therefore turn off system restore then do your scans restart your pc if clean turn system restore back on.