Hi q8vette,
You can always add more scenery at a later time if it is taking too long.
You say you are having errors with system files, which makes me think X-Plane is not installed to the desktop, but the file path looks right in the log.txt.
Please make sure the X-Plane.exe is in the X-Plane 10 folder.
Otherwise please make sure X-Plane is installed or moved to the desktop. Then right-click the X-Plane folder and open the Properties window. Go to the Security section and make sure the folder is writable to you. Also make sure the various folders inside the X-Plane folder are writable to you. (The description is approximate because of version to version variations in the Windows user interface.)