Windows 7 - photoshop cs5 lens correction time out , with desktop composition on!

Hi

i installed photoshop cs5 under Windows 7 32bit ultimate

and i noticed that the filter lens correction when i click on the search online i get a timeout error , if i click again without closing the lens correction on search online i get no profile found


but in the compatibility list if i enable disable desktop composition , i don't get errors


i tried everything , disable firewall , antivirus , uac , run like administrator , run in xp ,vista comaptility mode nothing


only disable desktop composition make it works


why can desktop composition give me this time out error ?

when i run photoshop cs5 , i get a warning , about colors

does photoshop cs5 work in full mode with desktop composition off


thanks a lot