I'm having this problem with bootcamp. I have it set to about 100 gb and am using a macbook pro 13 with 500gb. I had tried installing some game from the internet with no success and some error messages. It wasn't until after this, I noticed that most of the hard drive space was taken up. Out of the 80 gb that was free, I was suddently down to 10. I've checked to see what programs I have installed and with them all added up, it doesn't nearly come to use that amount of space. I believe it to be a virus or some self replicating file that's taking up all the memory. Has anyone else had this problem?