My younger brother crashed the computer over Xmas, Windows wouldn't run at all so the drive had to be completely reformatted. I lost all my work, and more importantly some pics I needed for coursework, and all my game files from the Sims 2 which I spent ages playing. The only stuff that survived was my music collection which I'd copied onto my mp3 player. I still haven't been able to install everything on yet, I have to ask permission from my dad to do anything, so unfair.
The other computer we have is being very unreliable, its suffering from old age so we're getting a new one. The longest any of our computers lived for was 11 years give or take and it has the processing power of a GBA (it was bought in '89) They don't make computers like they used to anymore, they're not expected to live more than 5 years without being replaced.