Stupidly installed this: http://www.mediafire.com/?3d2hbizmbzt wanting better performance from my Nvidia 8600M GT 512Mb. Was asked to restart after install & wouldn't boot (only getting the grey then blue screen in 10.6.2) Am now unable to boot up in anything other than Safemode. While installing update is gives the option to revert, tried this in safe mode but it ends in a fail. If it can revert then somewhere is a backup of the original driver yeah? Where is it & can restore it manually/rename it as the original? Please help as am panicing. Tried to use TimeMachine but won't boot for me in Safemode!? Cheers. J.