Windows 7: 3/4GB of RAM being used while nothing is using it. Slow performance.

There you go. You can also use System Restore to your advantage for this type of stuff as well. Keep reverting back to incrementally older dates until the issue disappears.

I decided to run sfc /scannow and it said "Windows Resource Protection found corrupt files but was unable to fix some of them. Details are included in the CBS.Log." Should i post that for you to look at?

Try running SFC again two more times to see if it will repair them. If not consider a Repair Install.

The VLC player running up CPU and RAM in Processes (was it playing a video?) is consistent with Display adapter problems which may be solved by reinstalling the driver, or eventually if necessary the card. But I would also try uninstalling VLC to run with WMP for awhile just to see the difference. It's not so bad. You can always revert.

Here are some other key troubleshooting steps to utilize the logs and system resources, hardware testing and other approaches leading up to Repair Install or Clean Reinstall with steps to get it perfect. Our installation forum is the top one in the world if needed.

Please reboot after every sfc /scannow.

Thanks for everyone trying to help me but downgrading my graphics driver did the trick. No unusual RAM usage since i switched them.

Good to hear things are working proper again. A little rule of the thumb I use is. Don't update drivers just because their is a new one. Do it to try to solve a problem. When it's not broke don't fix it.