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Windows 7 Updates Increased CPU Usage

I try to never update via Windows Update if possible, but my school, for whatever reason, forces us to update to access their WiFi network. Upon performing the updates, I noticed that my CPU usage has increased.

Before the updates, my speeds would be around 1%-5% at most, then it upped to around as little as 25% with little to no programs running and it now stays at 35% with Google Chrome (4 tabs), iTunes playing music, Excel spreadsheet, and Steam running in the background. It bothers me because I hear the fan running and lately my computer suddenly stops for no reason at all and I think it's because the CPU is overheating. (Currently at 35%, the CPU temperature is 67% and the fan speed is at 90% via Toshbia's PC Health app).

Is there any way to revert these changes, methods that can help me decrease my CPU's usage, or anything else I can do? My laptop is a Toshiba Satellite L755 running Windows 7 64-bit, I upgraded it from 4GB to 8GB a few months ago, and it has a AMD A6 -3420M quad processor.
 
Run Task Manager, see what's running that you don't want running (and that you know you don't need to run for Windows to work) and kill it. Also turn off all the services you don't need. (And think of changing schools - morons usually aren't very good at teaching.)

lol I just may; it seems extremely unnecessary to access a network just so I can browse the internet. What made it worse is that even after updating, I still can't access the network...:mad:

But yeah, I've tried those. I've minimized the list to as many programs and services as I possibly can, but I'm down to what I absolutely want and having to make sacrifices like stopping Steam even though I'd rather not have to.

EDIT: I ran a defragmenter and cleaned the registry through AVG's PC Tuneup and I can say that after a required reboot, my computer's CPU is down to 9%-15%. It jumps to 30% again when opening Google Chrome (one tab) but I'm liking the difference! It's not better than before the updates, but it's good for now. Thanks for the suggestions.
 
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