A few programs [url=http://www.google.com.br/search?q=cpu+temp&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla
t-BR
fficial&client=firefox-a]here[/url].
If you're having problems with videos and games, check if the video card is clean too.
You said you have a lot of anti-viruses, and now, many browsers. I may be wrong, but I bet you also have installed a lot of different programs with the same function. You may consider choosing your preferred and uninstall the others. Your Windows' registry can be kinda messed with all those apps.
/ 
