slow processor with XP

check your BIOS,and see if your cpu frequency is set on auto.A seting of 100 is good.If that is not the problem,go to your computer makers web site and download the latest drivers.

Is your system hitting your hard drive all the time? Try running your Task Manager and see if there is a particular program using up the majority of your CPU percentage (under the Processes tab).
Does everything check out in your system? If you goto your control panel > Device Manager, make sure that there aren't any alerts popping up... or anything obviously wrong.

Try installing more RAM if you are below 256mb. I recommend at least 512mb. Check out what is being loaded at startup. Most PC makers load so much to startup with Windows that it seems you did not even purchase a new PC. You can view what is beingloaded by typing msconfig in run off the start menu. Also you can check the event viewer to see any errors might be causing the problem. The event viewer can be found in the control panel under Performance and Maintenance.

XP comes out of the box with the cartoon interface and uses lots of cpu to support it. You can right click on the "my computer" icon then select properties/advanced tab/performance. Change the setting to adjust for best performance. Also check the startup group for extra programs running in the background. You can also use msconfig to stop extra and not needed programs from running when windows starts.
This should get you a noticable measure of improved performance from your 1.8 cpu.

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You may have a virus, or a worm like Klez. If you don't have norton installed, Install it. If you do, and it doesn't run, that is a good sign.