Thank you for
reaching out on the community and telling us about your issue. I do apologize for the issue you're having. I was taking a look to see what could be causing this error and noticed that it was a windows error rather than a quicken one. That being said I did notice that quite a few posts on Microsoft message boards have said that this could be a problem with an antivirus blocking the program from opening. If you do have an antivirus I would check to see if quicken is allowed to open from the antivirus settings. You could also try turning it off and seeing if then you're able to.
Once you get a chance to try let us know if you're able to get in if not we'll see what we can try next.