No guid

So- being kicked because of having no etpro guid has become very annoying. Everytime I shoot some headshots, someone yawns me and kicks me from the server. It's quite a problem for my mates, too, because we can't play a normal 3on3 match.

The link to my previous journal is here- everything's written there. And if someone doesn't want to read the whole text, I can make it shorter by saying that the problem is having no etpro guid after changing the HDD (from ATA to SATA if it makes a difference in that case).

So I want to ask again- does anyone have an idea how to solve the problem?