I am having problems with allot of the themes trying to use them on SP1. I had to do a system restore after installing tag theme for example. I think it was from the cursor but it caused windows explore to become unresponsive but i had no way to confirm this because of the desktop being unresponsive. The mouse and the cursor worked but that was it and the animation for the cursor would only work if I held it over the taskbar but not on the desktop.