Anyone have any true solution to remove what is causing my startup page to revery back to yahoo.com?

[Saykiatric]

I have tried every known solution that has been suggested the last one even looked good while I was logged on. I was able to shut down fire fox and open it and the start page remained the one I chose.

I then rebooted and to my displeasure when I opened fire fox the browser had been reset to yahoo.com thus I must assume this is something to do with the start up.

Whatever this is it has me stumped I have run all sorts of scans and vaporized what It has found to the point that there is nothing left that the software scans are ale to detect at this time.

Let me know if this is making sense to anybody who has had this issue or has a solution.
http://search.yahoo.com/?type=198484&fr=spigot-yhp-ff