Sharepoint 3 - Very Simple Migration

Hi all,

Apologies for the possibly silly question.

I have just migrated from 2003(x86), to 2008R2.

I transferred all the FSMO roles and demoted the old DC, which is now a member server.

Since doing this, the 'companyweb' website, which was running on the 2003 server, shows the error 'cannot connect to the configuration database'.

The problem is, I know almost nothing about Sharepoint. I read up on the errors, and played around with permissions, application pools etc etc and basically got nowhere.

I have a backup copy of the configuration database and content database - what I'd like to know is, what is the absolute easiest possible way for me to pull this very very simple and small (which was on the old server, and albeit not working) WSS 3 site onto the new 2008R2 server?

Can I just install WSS 3.0 and attach the database somehow?

2010 Foundation and attach, is that better, is that even doable going from 32 to 64??

I'm really looking for an ultra-idiot guide here, not knowing sharepoint at all, troubleshooting a process I don't understand just ain't gonna work

(I look forward to the colourful answers I'm expecting from Experts on this one!)