Windows 7 wimfsf.sys Install Error

Has anyone tried installing Windows 7 in Virtual Box and got a wimfsf.sys bluescreen error?

I've tried installing it using 20GB of virtual space, 512MB ram and changed all of the other settings (which didn't stop the crash). I get a wimfsf.sys BSOD after the "Starting Windows" message appears in the install process.

It could be a corrupt ISO file that you've downloaded - try re-downloading it and see if that works

1000 thankyous! I downloaded it again last night using the MS downloader and it works fine now.