To make Windows 7 run faster, delete rarely-used programs, clean and defrag the hard drive, and turn off unnecessary visual effects. Restarting the computer frequently may also help speed things up, as can adding more memory to the system. If the previous suggestions aren't helping, run a good antivirus/spyware program, to ensure that the computer does not have any malicious programs bogging it down.
Whether computer is new or old, chances are, there are a number of programs that are unnecessary and hardly ever used. These often eat up resources, slowing down a machine. By going through and deleting unneeded programs, a user may notice an increase in speed and performance.
After going through and deleting programs, running a "defrag" is the next logical step. When a drive is fragmented, it takes the computer longer to find all the pieces of a file or program. By defragging the machine, it puts all the small pieces of a program or file in the same location, making the machine run faster. The defrag option can be scheduled regularly or run manually, as needed.
Windows is also notorious for making appearance a priority over speed. Users can decrease or turn off many of the visual enhancements that affect the speed of the machine. These include window animation, preview windows and live wallpapers, and turning them off will often greatly increase the speed of the computer.