No apparently not.... Vista RC2 will not be recognized as a Vista compatible upgrade program such as XP is.  Accordingly, I have been advised that you need to backup files, do clean install or reinstall XP and then upgrade to Vista from there.

 

There are several forums that explain how to do the clean install....google it.

Well, actually there was a guy that did it on anandtech but unfortunatly after about a week or so an update bombed it as a non-genuine and he had to clean install. Save yourself the trouble.

 

The RCXX to RTM version is not as was stated above a valid upgrade path.

 

pcgeek11