FIXED stucked black screen char pick menue after loading screen

Hi, since last ~8mb update the game does not work any more. After launch button upcoming loading screen and a while of loading it turns black with intermediate sound (character pick menue) from time to time and the ingame mousebutton shows up moveable. Cpu load goes up to 100% up and down. PC is all 4 seconds stuck for maybe 20 seconds while black screening like told about above. During not being stucked i can go back to task manager and cancel the application. running packcheck does not have any report.

N fix fast please!

win7 64 servicepack1
4 gb DDR2
Hd 4870 1gb
Phenom 9850 @ 2,9ghz

-.- dunno FIXED

after complete restart of pc it worked fine again
maybe a driver problem...