Thank you for trying to help out. Yes, I it was working fine on the computer before. Yes, I was able to get past the welcome wizard on a prior occasion.
Then it froze for no apparent reason.
I then tried to reinstall Mnemosyne. Reinstalling didn't change anything. So I deleted the data directory under C:/users/<me>/AppData/Roaming/Mnemosyne and reinstalled again. That was the screenshot I showed you on the first post.
Then yesterday, it seemed to work and I was able to get past the welcome screen and reload my cards. Now today, I tried to start it and it again froze:
Thanks again for all your help Peter. I'm sorry if it seems confusing. Any questions please let me know.