|Compaq notebooks don't support 40gig of ram. You must be referring to the hard drive.|
Leroy you should consider getting a Computers for Dummies book so you will know what is what with a computer. If you continue to embark on the path you are on you will trash your notebook.
Only things you should be doing is...
run disk cleanup from the Accessories/system tools menu
I check everything except compress files.
run defrag from the same menu.
Mouse lags indicate software load on the cpu. Make sure you are using antispyware and antivirus, update them and run them.