Windows 7 probably a stupid question

But for the past 30 minutes my upgrade from Home Premium Vista to Windows 7 is stuck at "Checking compatability".

First time it gave the "install SP1 error" so I did
now it's stuck at the checking compat.
The bar on the mainscreen is moving, but it doesnt seem the small bar below is moving

Yea I am putting it on a pc over vista, actually its an 3gig memory HP laptop, but currently I use it to test new systems and such (MCDST training and such)

How long will this checking take? been 40 minutes now (my post takes long to type )

Maybe try doing a clean install rather than an upgrade.. Clean installs of Windows 7 (32 bit OR 64 bit) onlly take 20 mins to complete...

If you've got files that you don't want to lose or bother taking the time to back them up, then just create a new partition in Disk Management and move all your data files over to there then proceed with the clean install.. I wouldn't do an upgrade from vista to a beta version of an OS. just doesn't seem very practical...