Nvidia Ntune

I have 2 questions for this:
1.I've installed, i tried to go at performance, i "agree" but after that the blue screen appeared, and needed to restart the PC, everytime happened this, got a GTS 250, can ntune work on GTS 250? cuz i really want to speed up the fan a little
2.I've tried to un-install it, it says it cant, i deleted the folder, i tried going in control panel at uninstall, didnt worked, ok, i used CCleaner, i couldnt "run uninstaller", but i could delete the entry, didnt appeared anywhere else, not even in uninstall in control panel, but i'm asking now, how can i remove completely Ntune, in msconfig at startup it's still there....so i think it wasnt removed completely, i tried with ccleaner, mighty uninstaller and revo uninstaller pro. Any special "magic" trick to completely uninstall Ntune? without uninstalling the graphic card or dunno what else?