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Or are you asking "am I allowed?". I don't care if I am or not - I don't like leaving my files and Internet connection free to whoever decides they want to download something dodgy.

That is the thing. It isn't your PC. Most places don't like people installing unauthorised software as well. Especially something which will restrict access to it. What if you're on holiday and somebody needs to use the PC? Or somebody needs to install a patch?

You can't install software on the PCs here but if you could, I'd be really pissed off if a user decided to restrict access to "their" PC.

Keep your personal files on a USB drive as you appear to be able to use those. Can't do much else about it.