its probably your firewall or other windows protection...when your firewall is turned on it ask u should it allowed or not programs(like exe and others) maybe u mist it there...i had similiar problem with nvidia card and nvidia firewall and i know u can change ur setting as u like, theres bunch of options...the easyaest way is to reinstall your graphic card drivers lol...also reinstall your pb as tali said and check yours dx settings(run=>dxdiag)...also i use dxwebsetup to update my direct x folders its similiar program like pb setup and it really help with keeping dx updated...
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