Running out of ideas here.
The message, as I said, is classically an installation
problem but firstly you advise you have full admin rights and
secondly you can create new projects.
It can also occur if the project is on a network but you
state that is not the case.
Hold on, just looking through the thread, you say at one
point "I tried deleting the project file and recompiling, but it
gives me an error. It says it's read only," Does that mean you got
the project open and then got the message when you tried to compile
or that you got a different message when you tried to open the
project?
Do you have access to another PC you could try this on?
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