Okay so the chip is intact. At least that’s something. I’m 99% sure Rohos associated the pin you gave it with your chip’s UID and stored it somewhere in the registry. You can wipe the chip as much as you want, the pin isn’t on it, so Rohos will never let you in.
Can you still login normally (with a password)? Did you set an emergency login question? If you can still login, wiping Rohos will clear the problem. If not, you have to find a way to boot up the computer from a rescue disk and edit the registry somehow. I’m not quite sure how, the last time I did anything like that with a Windows machine was under Win95.