Graphical Acceleration screwy. GPU?

[Janna1]

Hello guys. I am not sure of what to do with this issue.

Sometimes (seemingly randomly) when my computer boots up, certain pieces of graphical acceleration seem broken. All graphical portions of the Windows Explorer GUI happen in extremely slow motion. Even something as innocuous as right-clicking to bring up the "copy, paste etc" happens slowly.

Moreover, when I open movies in VLC, they also happen in slow motion, with the dialogue from people within the movie corrupted to fit the new standard of slow. These aren't even HD movies, mind.

It will stay this way until I restart Windows (sometimes, I will need to do so several times).

All of this leads me to believe that it is some issue with my GPU. However, it isn't completely broken, since I can still watch movies in, say, Media Player Classic with no slowdown. Also, I loaded a videogame to see if it would render correctly (Dawn of War 2), and it rendered perfectly. No slowdown at all.

My specs are:
Core i5 2550K
8GB RAM
Radeon 6670
Agility 3 SSD

Thanks in advance.

 

[Jaydip]

Dude before doing anything ensure that your system is virus free.

 

[LoveMachine]

Open task manager and Catalyst Control Center and watch your CPU and GPU utilization while these slow downs are occuring. In task manager, you can see which applications are burning the most resources at any given time. Might help nail down if a specific background process is causing problems. As Jaydip mentioned, a virus scan wouldn't hurt.

 

[Janna1]

Dude before doing anything ensure that your system is virus free.

Virus scan run, nothing came up.

 

[Janna1]

Open task manager and Catalyst Control Center and watch your CPU and GPU utilization while these slow downs are occuring. In task manager, you can see which applications are burning the most resources at any given time. Might help nail down if a specific background process is causing problems.

Nothing untoward is visible in task manager.
I can play a demanding video-game for example, but graphic-acceleration on the desktop is slow. It isn't an issue of insufficient resources

Further evidence is that VLC cannot render a video smoothly, but MPC can, which leads me to believe that VLC is using some form of (GPU?) acceleration which is bugging out, and MPC is not using it.

 

[LoveMachine]

What driver are you using? For me, 12.8 on my 7750 works just fine, but 12.10 or the beta 12.11 was causing some weird audio bugs. Did you recently change anything?

 

[Janna1]

What driver are you using? For me, 12.8 on my 7750 works just fine, but 12.10 or the beta 12.11 was causing some weird audio bugs. Did you recently change anything?

I did upgrade to 12.10
I could always roll back the driver. I wonder if others are having similar issues.