The first thing I always do on any computer I work on is clean up the temp files.
Cleanup, click Start, point to All Programs, point to Accessories, point to System Tools, and then click Disk Cleanup.
Next Check the Following:
Downloaded Program Files
Temporary Internet Files
Setup Log Files
Temporary Files (Very Important)
Still Slow? If you are running XP you may need to defrag your hard drive.
Open My Computer
Right Click your Local Disk C and Click Properties
Click Tools Tab
Click Defragment Now Button
Click Defragment Button
Still Slow? Lets find out why. Next right click your Task Bar and Click Start Task Manager
Next click the Performance Tab
You should see your processor(s) and Physical Memory Usage History
OK some basics.
Lets start with the processor if its always at 100% we need to find out why. Click Processes Tab and Click the Column CPU to Sort by CPU Usage.
If there is one program that is taking a lot we can end the process.
Now if its a bunch of programs we could have an issue of your computer being too old and the cpu can’t keep up with the number of programs that are running
Click Here to View Post on Removing Unwanted Programs
Now for the Memory part if the blue Line is at the 80% mark or above after Removing Unwanted Programs then you need more memory