I had a working installation of WordPress, and I recently encountered an issue where when I tried to login to the back-end, the browser would redirect to the login URL of the previous domain WordPress was installed on.
I fixed this by reinstalling WordPress, and I can now login to the backend, but any new posts I make, or old posts I have generate 404 errors.
Additionally, if I try to navigate to any category page, I again receive a 404 error.
I have looked at the wp_posts table of my database, and the GUID field each contains the correct domain name and URL structure.
What should I be checking here?