Users of ATM 4.0 (Light or Deluxe) on Windows 95/98/ME who upgrade to Windows 2000/XP may encounter problems, and it is vital not to install version 4.0 into Windows 2000 or later; affected users are encouraged to visit the Adobe web site for technical information and patches. Version 4.1.2 is fully compatible with Windows 2000 and XP (It will run on XP 64-bit, but because the installer doesn't work it must be first installed on 32-bit XP and then copied over to 64-bit XP).