Laptops, busyness, and stress

I had one of the worst evening last night. I spent two hours trying to get my laptop to work again after I restarted it. When I turned it on again it had decided that it wanted to crash on me. It took me about an hour to decide that the best thing to do was to reformat my hard drive and start the computer back from crash. This provided me much stress as I had only one copy of my seminar on the Tupamaros and urban guerilla on the computer, usually I have a series of back ups. Anyway I recovered the file and the laptops working again, but this has meant that I didn't get a whole lot of work done that I should have last night. Now hopefully this doesn't happen again!