OK, so I think I've spotted a possible reason for the freezing. My laptop doesn't actually have PnkbstrA.exe or PnkbstrB.exe on it anywhere. Anyone know where I can get these, or if I'll have to copy them from my desktop (which I don't really want to have to do considering they are in the \windows\system32 folder). I've got the PB auto updater from the site, and running it adds the updates, but not the .exe files.