It took 2 hours to upgrade, or you've been using it for 2 hours? It's a big change from '03 and earlier but honestly once you've used it for a while you just realize how much better it is. Same thing goes for the new taskbar in Win7. Give it a chance.
Two hours to upgrade from Office 07 to 10. Did basic windows updates and then today had to do a system restore to get my laptop to start. I'm hoping the Windows 7 upgrade goes much more smoothly.