- Anti-spyware software
- Anti-virus software
- Registry and PC cleanup.
These software packages can help clean up your pc and help speed things up.
In addition, you should run disk deframentation from time to time (perhaps every 6 months or so). In Windows, click on Start in the bottom left-hand corner of your screen:
Start > All Programs > Accessories > System Tools > DISK DEFRAGMENTER
This will organize your hard-drive so it is more efficient.