Best tweaks to speedup Windows
Here is a zip file of all the registry tweaks I have compiled from the net or figured out for myself to improve speed, security and to get rid of generally annoying things.
You can grab the 3k zip file from here. I highly recomend you open this file with a text editor as I've well documented each tweak so you can understand what it does and when you're ready to use them, run regedit.exe (via Start > Run) and then do a File > Import. You should never double click .reg files as it's a security hole (imho) and actually this tweak file disables .reg merging on double click to improve system security.