I am sitting at an Internet Cafe in Macerata where we are spending the weekend, and there's only IE installed. I did not remember IE was such a pain to use, and since the owner claims that Firefox trashed one of his machines a while ago (uhm...), I have been forced to find a way to install it on Windows without administrative rights. Google is no help in this occasion, but if you resort to one of the basic principles of Unix systems administration ("it's always a permissions problem, stupid!") it turns out it's very easy: just select the Custom install, and select as a target folder one you can write to, such as a new "Firefox" folder on your Desktop.
That’s great, now I can finally install a copy of firefox on my university’s network!
Ciao,
Erwin.
I am doing such tricks all the time at my school network :D