|You asked for thoughts & I gave you a thought. Generally, 3GB is the limit for a 32-bit OS. It officially supports 4GB but only 3GB +/- is useable. You would have been better off going with 2 x 1GB + 2 x 512MB or as kuwese recommended, upgrading to a 64-bit OS.|
"pentiun dual core 4800 ghz"
I believe the fastest "pentiun" dual core is 3.2GHz. Where did you find one that runs at 4800GHz? lol. I suspect you have a E2220 2.4GHz (2400MHz). You do NOT double the core speed to come up with 4800MHz. Your CPU only runs at 2.4GHz. I don't think you know as much about PCs as you may think.
How about telling us which video card you have & which online game(s) you're playing? The CPU useage may be due to gaming, but you may have something else going on - virus or malware infection, too many apps running in the background, bloatware such as Norton or Mcafee, etc.