without admin rights you cannot install the game on the pc.
Besides if you are located in the US, it is grounds for dismissal.
There has also been reports of people actually being sued by companies for doing so.
I am guessing that your work PC is actually a laptop that you are taking home with you every day.
The only thing i can think of is to contact the Technical support department of you company and buy them a whole bunch of donuts and then ask them to give you admin rights on your PC..,....
Sorry but that is all you can really do