AAARGH! My WFC is stuffing around with me tonight for some unknown reason. Here's what happened...

Started up the program
Logged on for multiplayer
Looked for a Conquest game to join
The "Finding Game" box then suddenly disappeared without me cancelling it. Weird.
Tried again - entire program SHUTS DOWN.

Starts game again -- NO start up menu appears (ya know, where it says "Play Game, Uninstall" etc. - it just started the game straight up. Also never happened before.
Sign in and try to join a game. Find game menu shuts down. Try again - whole program shuts down.

So I run a quick scan and 20 threats are deleted. Run program again - same result.
So now I'm backing up my system to run a full scan... but graaargh... I would really HATE to have to uninstall the game and LOSE all my save games and multiplayer characters.