I'm in a similar situation. EVen when my computer pops up with "Updates are ready to be installed for such and such a program" I can't click to install them since I don't have admin access to the computer.
I did, somehow, manage to install FIrefox on my computer, as IE will sometimes freeze and if I need to get to the page in question, Firefox will suually have no problem, so I suppose I can use that to log into EvC, but I definitely can't use it by default, otherwise someone may notice and {poof} there it goes.