As far as I remember I installed Virtual Guitarist (1) from the original installer disk. I am not sure if I had to do something special to install it. It is almost 2 years since I installed the VG1. But I have it running fine on my Cubase 6.5 64-bit on Windows 7 now.
The Virtual Guitarist EE has a newer installer found here: ftp://ftp.steinberg.net/Archives/
The name of the file is: VG_EE_Installler_Update.exe
I also have Virtual Guitarist EE running on Windows 7