When I download Firefox onto my Windows 10 computer, it will install and there are no problems until I try to open it. I get the error message, "Your Firefox profile cannot be loaded. It may be missing or inaccessible."

I have searched for ways to fix this, including going to run (windows sign + r) and typing "firefox.exe -p" (no quotation marks), but I get the same message as before. Another thing I have tried is going to the %appdata% folder and renaming or deleting the firefox folder in Mozilla, but it just appears again when I try to open Firefox.

The version of Firefox is 41.0.2, (if that helps).

Any help will be appreciated :)