I had severe problems with SP2 on my computer. I suffered through total lockups, menus not popping up, and double-clciking icons did nothing. Some software would refuse to install as well. My advice is to uninstall SP2 if you can, install SP1 and wait until the official version comes out.
This probably goes without saying, but your problems could be helped if you defragmented and cleaned up your HDD's.
The Bluetooth stack server thing looks like it could be a problem, have you tried disabling it and then running your computer?
Also, this is the thread of mine dealing with SP2,
http://www.tfproject.org/tfp/showthr...threadid=55499