Program won't save work

I updated to and now I get an error message that states my project can’t be saved . Access is denied. This is happening in the project writer window.

I have uninstalled, rebooted the computer and reinstalled Scrivener and still the same error message comes up. I can’t afford to lose all of my work because this program won’t save anything I write to it.

What is going on? I need a solution now!