Windows Live ate my saves

I decided to spend my BillPoints on Broken Steel, probably the most interesting of the Fallout 3 DLC so far, not least because they have raised the level cap to 30. I had already hit the old cap but was nowhere close to completing the main quest line. What a fiasco it was just getting the content, the day I decided to grab it was the day Live was down for 24 hours and when it did come back up the marketplace was screwed, so 48 hours later and I finally grabbed it.

Dropped back into the game but nothing came up and I did give it ample time to realise it had new content, decided to do a Live update in-game. This was a mistake, the update looked like it worked but crashed at the arse end. The game runs but all my saves have gone, the new content is being discovered but the game hangs on exit.

All in all, quite an exercise in FAIL.
On the bright side, I get to play through it all again and play with some different perks but having to kill the game from the task manager every fucking time I want to exit is a giant ball ache.