As this is a work PC get back to their IT and have them fix it.
They could have "policies" that block such apps.
I have three different devices all that run windows 10 64-bit, on two out of the three home desktop and laptop will install VirtualBox and other software in 64-bit. However my Work PC will not despite it still operating a 64-bit operating system. Does anyone now why this is?
system specs:-
CPU: intel i5-4690K
RAM: 16GB Corsair Vengeance pro series
Motherboard: asus z97-P
Graphics: GTX 750Ti

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic