I STILL have a virus/adware/spyware or trojan horse even after I did all of these things…?

I used my three recovery CD's I had made a year ago and re-did everything. I ran AVG, Norton, and several other anti-virus programs. Here is what is going on: From my Yahoo main page, I do a search. On the search results page, EVERY search result is a re-direct to buy junk or fake anti-spyware programs! When I have Google search as main page, this doesn't happen. I can't find any original discs, just my three recovery discs. Those took 2 1/2 hours to re-do the hard drive! I thought that would take care of it. Okay, DON'T click on this or cut and paste it: http://rds.yahoo.com/*bleep* is what is the problem. That "bleep" is a bunch of letters and numbers that re-direct Yahoo search to send me to a website to sell me junk. This virus/adware program seems to be the only one left on my computer. FIVE anti-virus sites have failed, and three recovery discs have failed, and I can't find any original software for my HP Pavilion laptop (bought in 2006). Ideas??
By the way, I did ALL of the anti-virus stuff in Normal mode AND safe modes.

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