I hate Windows!

I'm going on a long train journey tomorrow to see Richard's dad and some of his other family members. An hour or so ago, I decided to install the new expansion pack for The Sims (Hot Date) on the laptop so that we could play with it on the way. The install took a while, but seemed ok, and I'd just started the game when the machine ran out of disk space. So now I'm having to defragment the drive. I'm not sure whether I should just leave it running all night, or what. I think it might be important that I stay up to watch in case anything goes wrong. *mutter* The joys of an incompetent operating system...