Also you may want to get it from Microsoft instead of that other forum you noted.
"I have a windows 7 ultimate iso file from w7forums.com" means support must come from those that provide this.
if you are planning on downloading Windows virtual pc 2011.
be sure to use a version internet explorer to when trying to download Windows virtual pc 2011.
if you use google chrome to as the microsoft webpage this download is the genuine Windows Validation Process may or may not work due to an Windows Validation plugin for now does not work with google chrome