Recently my CPU rises a lot

[Rylund]

Norton 360.

Yeah, I'd recommend swapping out Norton for Microsoft Security Essentials. It's free from Microsoft, and is a much better antivirus than Norton. It won't hog resources either, which I believe Norton is doing. It could also be a virus causing the spikes, so I'd do a full virus scan to see what it comes up with.

When i had microsoft security essentials my pc had virus everywhere, i did then swap to AVG and thats a perfect program (even the free version)

For the time being, I would access your computers startup, by loading msconfig, and click on the GENERAL tab, and select the DIAGNOSTIC STARTUP, which basically only loads up basic devices and services needed to load Windows.

After you have done this, see if the 100 percent CPU usage stops away, if it does then its some program you have running when your PC starts up. If this is the case, then enable a startup entry that has been previously deselected (BUT ONLY ENABLE ONE AT A TIME), restart your PC and test to see if the 100 percent CPU usage reappears. Keep doing this (MAKE SURE YOU RESTART YOUR PC AFTER YOU ENABLE A STARTUP ENTRY) until you see the 100 percent CPU usage problem reappear. When you do, remember what the last thing was that you enabled in the startup, and that will tell you which program has been the cause of the 100 percent CPU usage problem.

Yes, this will take some times. But if your pc still run on 100% after disabling diagnostic startup. Then you should simply just enable it again and try some other soultions.