really I dont understand why *.ini upload doesnt work for you. I checked double registering system and no record there, so there is no real fact, why you cant register. There are no cookies or so..hm, try to install Firefox 3 or other free browser. If your problem will be continue, we can solve this via Skype or so (what about Spyware? It cans causing also this situation, when is reading form data) ..password for server you can find in PM.
edit: anyway we are also in bad thread
edit2: I found this thx to 3P, so I am abs out, what is wrong on your side or my site...