fedora 17 hangs on login screen

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http://forums.fedoraforum.org – hello, this is my first post in fedoraforums..i had installed fedora 17 dual boot win7 on my desktop. yesterday i bought nvidia gt 610 graphics card and installed it..it worked fine on windows 7 and the games proved it. i also updated its drivers. but when i tried to enter fedora 17 it got stuck in the log in screen..the mouse wouldnt move also..tried restarting but got the same problem..buut the card works fine in win7 please tell me how can this be fixed?? (HowTos)