Some random tips:
1)Defragment hard drive at least once a month (duh)
2)Clean up system startup processes by going to Run > msconfig and then decide which programs you
really need on startup.
3)Keep your desktop clean and your My Documents folder organized. Clean up the files that you no longer need or burn them onto a disc and clear them off your hard drive
4)Add more RAM to your computer or change the RAM timings (more technical)
5)Add new components to your computer (ie if you have an onboard video chip, get an actual video card, or for onboard sound, buy a sound card)
6)Get a new computer
