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There are many ways to make PCs faster. Users can choose from different levels of difficulty and effectiveness.
Many users keep their PCs switched on for days or weeks. For these people, regularly rebooting the PC every day is a quick and easy way to speed up Windows. This frees up memory (many programs "leak memory", they don't properly release unused memory), allowing Windows to make the most of available RAM.
Defragmenting the hard disk (rearranging the hard disk so that files aren't scattered all over the disk) is an extremely effective way to increase speed. Windows comes with its own disk defragmenter. There are also commercial (Diskeeper, Vopt) and free open source (JkDefrag) programs. They have different features but all of them work. Windows users should defragment their hard disk every week.