This build appears to work fine for me and fixed a problem I was having with sound and windows7.
BTW, you can get a trial version of Win7 RC1 good till 6/10 from http://www.microsoft.com/windows/windows-7/download.aspx. It appears you must be doing it from a PC to sign in but when I received the link for the download, was able to retrieve it on a Mac to burn the DVD.
Parallels Desktop
Run Windows simultaneously with OS X.
Version: 5.0