Well here's what I've found about the error that you recieved.
http://support.microsoft.com/default...b;en-us;324764
Maybe that document from the M$ website should help.
Also, I've read on a couple sites that AGP440.sys has some problems with Plug & Play being turned off in the BIOS. Since your BIOS got reset I would bet that you overlooked that setting when you reset your bios... turn Plug & Play option ON.
I hope that BetaONE has helped you resolve your issue.