same problem here, with windows 8.1 64Bit and Cubase 8.05
the virus is just working on new projects, later on when i try to open it, whole cubase crashes...
i had similar bugs on my old 32Bit System with Cubase 5, got Bluescreens when i wanted to use the virus on advanced projects
System:
I7 4790k
16GB Crucial Ballistix Sport
Gigabyte Gigabyte GA-Z97X-UD5H Motherboard