Another thing might help,is that a scan for malware which,Malwarebytes,Spybot,are freebies that can do good clean up of your rig, just Google them up.Delete all the cookies from IE,you may see improvement on cpu load.The other thing that can cause havoc is anti-virus software that is always updating like a running faucet drawing load.
If you can schedule update its option to set with in the software.Funny thing the one workstation with Xp give me less trouble than the one with W7 that I have.I get high cpu loads when I get a malware attack.
Even a mistake may turn out to be the one thing necessary to a worthwhile achievement Henry Ford
If I have ever made any valuable discoveries it has been owing more to patient attention than to any other talent Isaac Newton
I have not failed Ive just found 10,000 ways that won't work Thomas Edison