Not sure how comfortable you are with working with computers (since this is your first post), but ..
If you Open the file you mentioned;
C:\pt\INPUT.TXT
It will open in Notepad most likely. This will reveal some interesting data.

You can look at that file and see where it is trying to write to.
Most likely issue is the line where it says
"Output=1= ..." (my dot-dot-dot will be replaced with a file path in your INPUT.TXT file)
This is where PT is trying to temporarily store your recorded audio.

To me, your error message implies PT doesn't have permission to write to that path/folder.
Running as Administrator may fix it (as Noel pointed out), but changing the permissions for this folder is another option to try. Maybe your temp storage area is protected by antivirus, or something else.

Just trying to help ..

Make your sound your own!
.. I do not work here, but the benefits are still awesome