Last week, I bought a pair of Yamaha KX61 keyboards to replace a broken organ. They came with a limited version of Cubase software, called Cubase AI. Unfortunately, the software refused to install on my Vista 64 box, crashing in the annoying license checker scheme. The exact error message was Syncrosoft Protected Object Server has stopped working.
After much research, I found the solution to this problem :
1. Disable DEP in Control Panel/System/Advanced/DEP
2. Reboot the computer
3. Reinstall Cubase
4. Re-enable DEP, with the exception of the SYNSOPOS.EXE program., which lives in the C:\Program Files (x86)\Syncrosoft\POS on my system, but might be in C:\Program Files\Syncrosoft\POS for those with 32-bit systems.