I managed to solve my problem, but I didn't manage to run iPCU. So, as I said, I managed to run it once, but not after that. So that first time I created a profile configurafion (for my college's wireless), but I had to restart my iPod software, and I the configuration installation on my iPod was lost. I recently found out that a configuration profile is an XML file, and I've searched my computer if maybe it didn't delete itself upon uninstallation of iPCU, and it didn't 🙂
So, what I did was upload it on a server, and typed the URL in my iPod, and it worked, it asked me to install the configuration 🙂
So, if anyone by any chance has already made a configuration profile on his iPCU, and he needs to install it again, but cannot run iPCU anymore, he can upload it somewhere and do what I did. If he needs a server, he can contact me, and I can upload it for him (janko@anor.irb.hr)
The path of my configuration profile (Windows 7) was: C:\Users\Your
username\AppData\Local\Apple Computer\MobileDevice\Configuration Profiles
(You have to have "Show hidden files and folders" enabled)