Pieter-Jon

I know that its take some time when installing an operating system but i think mine is taking a bit too long. When i try to install 7 it gets as far as the 2nd step which comes right after copying new files. It goes to this step and stays at 0% for over a hour. Can someone tell me what might be causing this? I have installed 7 before on other computers and i have never stayed on the 2nd step for over a hour and I don't think its the computer because i have installed 7 on it before successfully and it has never taken that long before.