Gtx 660ti Problem?

[gotek14]

Hy guys i have some problems with my graphic card.
Pc Specs;
i5 750 oc 4 ghz
8 gb ram
GTX 660ti
Motherboard Asrock P55 pro.
The problem is when i render some videos or i play some games the sound stop working.I go to youtube to watch a video but i see only frames(lag).I don't know what is the problem because the first gpu was a hd 5850 but i never had this problem in past.
I have the last driver.
Maybe the problem is this?http://imageshack.us/f/31/68062132.jpg/
I unistall the ati driver but that option is still there...
Any suggestion solution please?
I use Windows 7 64 bit

 

[Deemo13]

Yea you should have uninstalled the ATi drivers first. Try that.

 

[gotek14]

I reinstalled my windows and still have the problem...
Right now i played bf3 like 1 hour and no sound....
Any suggestion/fixes?

 

[Deemo13]

If you don't care much about sound, you could get a cheap new sound card.

 

[gotek14]

Still have the problem...
I render a video and now i don't have sound and youtube videos are freezeing ?
In games its work fine but .....i don't know what can i do to fix that

 

[envy14tpe]

Return your graphics card.

 

[gotek14]

The card is good i mean in gta iv bordelands 2 work very good no lag no freeze and sound is working.I bought a asus xonar dg and i think now its works