I used very well my Dagesh 2 with all versions of Windows, since 3.1 to Vista and W7 32 bit, now I got a new Dell notebook running W7 64 bit and cannot install Dagesh2. What can I do about it ?
Windows 7 x64 is an operating system with a completely new architecture and structure regarding running applications. If the application was working fine on the systems you specified then you should use a compatibility trick (right click on the executable > Properties> Compatibility tab> Chose Windows Xp/Vista).
right click on the executable > Properties> Compatibility tab> Chose Windows Xp/Vista
If it's not working you could try running Windows XP in a virtual machine and see if your application works.