You have to do it with administrator level. You wont have access with a normal user account. In the Start menu somewhere find the program "Command prompt". Right click it and select Run as administrator. Then do A. If you dont have administrator access you have to boot the computer with the admin account. Note: Make sure you have at least 4gigs HARDWARE ram, that you have a 32 bit OS and its NOT Windows XP before doing this. To check you just right click My Computer and select properties. A info screen should pop up telling you among other stuff how much memory ram you have and what bit OS you have. I actually though they had fixed this issue with the game. Then again I didnt bother swapping back because I like having my system this way now.