The best way to increase the speed, of any computer that currently uses Windows Vista, is to switch to any of the free, Extremely powerful, Linux Operating Systems, or install Windows XP. You can visit DistroWatch to see an up-to-date list of new distributions coming out almost on a daily basis. The most popular Debian Distribution is Ubuntu The most popular Red Hat Distribution is Fedora Debian is the root OS of many distributions, and I personally use it. It is extremely stable, and very powerful!! Installation of any Linux Operating System will increase the speed of your computer. Take a Windows Vista Laptop or Desktop PC to the next level by deleting Windows, and Installing Linux. If you are not ready to install Linux, a great way to speed up a Windows Vista PC is to install Windows XP instead. Windows XP is rather stable, I have great experiences with it, and considering the increasingly powerful machines sold for use with Windows Vista, the installation of XP should produce a marked performance improvement. :) Note that with use of VirtualBox you can install WIndows inside of Linux :)