Dears :
there is too many way to make your computer being more and more faster first of them is to go to c:\windows\prefetch and delet all the file on it
second try to search about the following files
*.bak
*.log
*.nai
*.temp
*.*~ and *.~* and delet every thing
as for me these two methods is very important to get the top of speed in your computer and it is very usefull
the other thing is the compatibility of the system with your hard disk try to reduce the size of your hard disk and try to make it 5 giga and i am sure it is enough
after all these solution if your problem still try to change you hard drive to SATA serial ATA
thanks with best regards
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