Shoutbox

I've been using Messenger Plus! Live with Windows Live Messenger for around a month now and for some reason, it keeps vanishing every so often. It's still listed in my Add/Remove Programs list in the Control Panel, but I can't find it anywhere else on the the computer, even using a search.

I was using it last night, and had no problems with it, but when I started Windows this morning, there was no sign of Messenger Plus at all. This is the third time this has happened, and it's getting annoying that I have to keep reinstalling it. Is there any way to stop this happening?

I'm using Windows Messenger 8.0 on Windows XP Home version and am currently not using any anti-virus software as the last one I used wasn't very good so I'm trying to find a decent one.