Real Player always gave me nothing but trouble. So I don't blame Alex for not putting up with it. However, for those of you still having trouble with vids not playing back etc. download Real Alternative. It will play Real vids in the player of your choice (ie. Windows Media Player) and it is only about 5 megs. I have never had trouble playing a Real vid since.
You can check it out here:
http://www.free-codecs.com/download/...lternative.htm
Also there is a QuickTime Alternative that does the same thing, for a fraction of the size.