Large scale deployment

[ar01]

Hello there,

I hope I'm posting this at the right place in the forum.

I currently work for a vocational center that teaches student about IT and technical support.
All of our computers are Windows 8.1, latest Intel processors and at least 16GB of RAM, plus they are all members of a domain.
In order to teach them about older operating systems, or Linux or Windows Servers, we use VirtualBox in some of the classrooms and now there is a request to install it on all workstations in the campus.
We are talking at about 250 workstations, give or take.

I tried msiexec after extracting the content of the exe file and it didn't work.
I tried psexec and it didn't work.
I tried a combination of psexec and msiexec and it didn't work.

In all cases, I kept getting errors 1603 and 1619 with Access is Denied.

Is there a way to deploy VirtualBox to multiple computers?
How would I deploy the extension pack for the latest version?

Thank you for all your help with this question,