Hi,
I think I have a solution for your problem.
First download this tool:
http://blogs.pingpoet.com/overflow/p...s-20050611.zip
to extract the data of the .msi virus installer file.
After that go to the device manager and manually install the drivers for the virus midi and audio device with the path of the extracted files.
For me this worked perfectly. But unfortunately the Virus performance is not very well under windows 7! A lot of crackles and if you have the virus control vst open it goes even worse...