After first restart, I can't get past the loading screen

> I recently bought the retail copy of Windows Vista Home Premium Upgrade. I
> ran the installation and choose the clean install. Everything seemed to be
> working right until it restarted for the first time (this is part of the
> setup) It restarted and went into a loading screen similar to the one for
> Windows XP. The problem is that it stays on this screen and never progresses.
> I've even left it on for several hours with no result.
>
> If I try to run from the Windows Vista CD it loads files then goes into the
> loading screen also.
>
> I ran the Upgrade adviser and everything checked out fine.
>
> My system specs are:
>
> Intel Core 2 duo 2.17GHz
> ATI Radeon x1700 Pro
> Intel motherboard
> 2 GBs of RAM
> one IDE HD
>
>