My Hauptwerk does not work

I've had the free version of HW for years on my PC and it suddenly stopped working. I've reinstalled it again but nothing happens. What could be happening? I did not make any changes to my PC. Please help me. Thank you.

We're going to need more information than "doesn't work".

Does the St. Annes organ load? Is there just no sound? What happens if you select some stops and click on virtual keys?

Also, this thread should be posted in the Free Edition Support section. A moderator may move it before long.