On missing MSN sounds, My MSN messenger 7.5 apparently lost the ability to play its *.wma sound files - possibly after installing our UK video on demand "Channel 4 4oD". I had to go into Control Panel > Sounds and Audio Devices > Sounds, and scroll down to "MSN Messenger". I found that clicking on ">" to activate the sounds only gave an error message. I got sounds back by copying *.wav files from my C:\messenger directory into my C:\Program Files\MSN messenger directory, and then selecting the *.wav files for each of the events. If any more sound devices fail though, I might Restore back.