mippoh: mm.. you shouldn't need to register the game unless you are talking about entering the securerom key
Could W7 screw over the instalation process, hmm. With my luck...
Going to make some more tests and see what it turns.
------------Edit------------------
Reinstalled under XP and now works fine; havent uninstalled, just erased the old directory and make a new install, even use the old login. It work at the w7 too.
Still going to make a w7 exclussive isntall, to corect a few issues that appeared.