Chances are if they had a problem with it corrupting their computer they were playing with something they didn't understand and should have played with and it screwed something up.
Ive been thinking about using it for some time as well, from what I can see is the problems seem to occur when people try to remove it, it has something to do with the boot loader as when it installs it makes a partition in your windows, can someone confirm this, and say that they have removed it easily? I have spent a little time on it running it from the CD.