What does Task Manager show you? What processes are using the most CPU?
Here is a method I use to see if programs running at startup are causing a problem, or in your case using a lot of CPU.
How does it behave if you boot to Safe Mode with Networking
? If better then something is starting at boot that is causing the problem.Advanced startup options - XPAdvanced startup options - VistaAdvanced startup options - Windows 7Use msconfig to determine what is causing the problem
These are good tutorials on using msconfig in XP, Vista or Windows 7:How to use msconfig in Windows XPHow to use msconfig in Windows VistaHow to use msconfig in Windows 7
Click on Start
, type msconfig
and press Enter
Click on the Startup
tab, record what is currently starting then click the Disable All
Reboot and see if it runs better.
If yes then use msconfig to enable several items at a time till you find the culprit.
If no, start msconfig and click on the Services
Check the Hide All Microsoft Services
box, record what is currently starting then click the Disable All
Again, do a regular boot, see if it runs normal.
If yes then use msconfig to enable services till you find the culprit.
Once you've found the culprit, uninstall it or find out how to eliminate it from your system. Simply disabling it in msconfig is a temporary fix at best.
Enable everything else you disabled.