what i do is i go to the RUN dialogue and type REGEDIT

Then i go through all the keys that are labelled EPIC MEGAGAMES and delete ALL JJ2 related items. Then after you go through EVERY key, you reinstall the game. It always works for me.

Then, when you install your 1.21/1.22 version of jj2, just do the patch and it should be fixed.

Hope this helped.

P.S. Im on my lunch break and this is the last time you will hear from me for a few hours. Plus i have to work tonite >[. Cya