Try alternative players that 'might' not be affected by this issue. Not being a windows person I can only suggest this one:
VLC (its free) & plays many video formats. It doesn't have the best controls but it works. Heh u can't ask too much more than that. Oh & alternatively get the codec packages that your player may require. See this thread:
http://www.gnutellaforums.com/showth...threadid=27539