Can't install Factions, odd error report.

Hey guys,

I recently had the urge to reinstall Factions, but whenever I try to install it on my computer, it says I either don't have the rights to install stuff on my computer, or that I don't have enough space. Now, I've been away a while, but I doubt it takes up more than 25gb.

Anyone know a solution?

Edit: Oh, and the disks do work on my sisters laptop.

You need to run as adminstator

I never used my discs. Ever.
-image it.

I only had one account on this computer when I tried. So that was the administrator. And I tried to download it from the official website aswell. Didn't work.

I created a new profile on this computer and it worked.