Not sure if you can help on this one...

I thought I would never see the likes of the "MyStart" low-lifes again on my PC.

I'm a writer and do a lot of search work.
I use fire fox and somehow either through a download or another method the MyStart Search Engine has taken over my Firefox "Search Engines"

I have removed all the engines and still it keeps popping up and self-defaulting itself. I've done a virtual manual search of every part of my C: drive, registry, every folder, User folder and all installed Programs and still cannot locate any sign of where or how this bastard "MyStart by IncrediBar.com" is.

Do any of you have any inside ideas how to find and disable/delete this SOB.
3.30 in the morning and frustrated!