well idk i just put the 3 games i play on here today to try it out so idk...... even with "low" ram i should beable to watch dvds and youtube videos with out a problem
I would try official drivers if there are any available.
If it started randomly, then it's not a problem with Windows using too many resources. I'd make sure there isn't anything in the background hogging up the CPU. Some things I would try are:
-Virus and spyware scans
-Registry/junk cleaner (I like Ccleaner)
-Check startup programs for anything you don't need