Grymking

Hello people, im a new user on Computer forum!
I work as a mechanic and we have a lot of stationary computers.
One day a work mate of mine actually managed to install flashplayer on one of our 15 computers and got past the system they have to block installs from the net. Problem is that he has stopped working with us and moved far away. And as a bonus no-one has his number.
Well, on to the problem i have: We have now 1 computer where we actually can watch youtube and such, we want it to work on all computers.
We can NOT log in as admin and we have tried, without success, to install flashplayer. We do have USB slots if that can help.

If some kind soul can give some ideas or even better tell me how to install flashplayer i would have my soul in debt to him/her.

(When working only nights for 10 hours straight you go insane without various ways to relax with a computer, and when everything you wanna see is blocked you freaking explode)

Thanks for answers!
Grymking

*Edit: I hope this thread isnt braking any rules of the forum, if so slap me on the wrist*