Is your windows running too slow? Here am not going to give a detailed description of how to speed it up, but i just wanted to share a few links which are worth a read.
As you may know the basic things you want to speed it up are
1. Less startup programs
2. Remove unwanted programs
3. Remove temporary/cache files (You can use CCleaner for this)
4. Defragment hard drive for faster access
5. Remove unused registry entries (You can use CCleaner for this)
6. Stop unwanted services.
And more than this there are few, read the following links
Remember changing registry values may hurt you computer, so make sure that you are doing it right and to keep a backup before you start editing.