Thats painful, more painful if you dont have broadband as then you are also spending hours just getting it all to work again.
I had it happen a couple months ago, before I even started playing through BGs again, but it happened for NWN2, horribly boring game, with no real character development, however I wanted to keep my character for the expansion arriving when ever. I likely wont even get the expansion now, I dont think my brain can handle playing through that game again.