For XP users .
Make the paging file size min = 1.5x max=3x
Go to RUN and type in MSCONFIG and go to startup . Google to find out what the services are . Untick what you dont need .
Click on start/ control panel/system/advanced/performance settings/untick all the boxs except for the bottom two then press ok.
Download and clean harddrive with this
http://www.filehippo.com/download_ccleaner/
Use the xp disk cleanup .
Defrag the harddrive .