LymanL

4 Ways...

Clean (Virus Scan, Delete unnescessary files, Clean history)
Arrange Your files
Remove all unused software or programs
Defragment your computer at least 2 times a month.

Farrah

Use Tuneup Utilities 2011 to boost up your PC. its a best software for your PC. i am also using this software.
Thanks!

petsimcox002

A lot of the substance as a space only advice is to clean your registry to get a registry editor or cleaner to make your PC faster.

mramtrust

clear cache regularly

SolidShellSecurity

Disk defrag has always been the big way for me.

Darkplanner

I recommend you format your computer. Backup important files to a spare HDD or USB's or something and then format your computer. You will notice a better response time as your computer isn't cluttered up anymore.

Also regular maintenance like defragmentation is requires to keep your computer's "speed" consistent.

bullten

use tune up utilities

loverichie

You can speed your pc,by Removing spyware, which would be help in protect your computer from viruses.

iigwk

What I do on computers that run slow is I use RegistryFix to clean out the registry - cleans out all the old and unused files.