Video problems

[Karlsson]

Hi everyone. I would like to ask for your help with a problem and I am having and I have not been able to resolve. My computer is the following: Q6600 (2.4@2.7, Abit IP35 Pro, 4 gb ram gskill 1000, ATI 4870) I have recently updated to Windows 7 ultimate 64 and since this, I am having problems with videos. They just wont play smoothly, they skip. I am currently using ati catalyst 13.1 but I have tried other versions but still happens. I thought it could be the vlc player, tried various versions too, but nothing. It happens too in WMP. I have tried modifying Catalyst control center options to try fix it, but again nothing. I am kinda lost of what next steps to take now to try to fix this. Also, maybe related to this matter I have had some problems too with Firefox, the text of the web pages would show correctly, they were blurry, that got fixed disabling in options the hardware acceleration, but I still experience that the scrooll of the webpages is not smooth. So I am thinking somewhere tehre is video issue, but i just cant find where. Please help! Thank you very much