According to the official information, AutoCAD Map R2 is not compatible with Windows 7. Even Windows Vista is left out of compatibility when it comes to this software. AutoCAD company released a compatible version for MAP starting AutoCAD Map 3D 2011. Starting 3D 2011, the software was released as being compatible with Enterprise and Ultimate versions of Windows 7, Windows Vista and Windows XP, as well as Citrix systems. For more information, I strongly recommend on using the official requirements for AutoCAD Map. Based on those requirements you can purchase a compatible version. Unfortunately, the one you have is not compatible with Windows 7 even if you apply compatibility tweaks.