You can buy a second DVD drive for your PC for $30 or whatever and then use that with PowerDVD or InterVideo to play the disks on the PC. The drive will be switched to Region 1.
If you then use it with a Region 2 DVD it will switch to Region 2 again. You're only allowed 4 or 5 switches before it gets stuck. Be careful to use that drive only for Region 1 disks and the other drive only for Region 2.