One tip you may find useful. SP2 breaks Dreamweaver if DW is already installed. But if you uninstall it, load SP2 then reinstall DW, it seems to work just fine. I have no idea why, or if this will work for you. But it's working fine for me. I do have DW in a separate partiton from Windows. Perhaps that makes the difference.
Keep Jeber's Help Desk in mind, and send me your ideas, tips and suggestions (jebers.help.desk "at"