Draftsight V1R5.1: installation issue

After product's downloading I started setup process, the system starts regularly but when is trying to copy file on c:\\ProgramData\\Application Data the system stops with no way to complete the installation.

OS: win7, 64 bit

HW: Dell workstation, 4GB RAM, 1TB disk no graphic accelerator

The Application Data is not a real directory but a windows junctions pointing to the \\\$:\\users\\UserName\\Appdata\\Roaming then there's not a real chance to force writing  any case, if so, probably registry will not update the regedit32; any suggestion about how to solve the issue?

Thanks a lot in advance.

Cheers

Gaetano