I have accidentally deleted the prv files.I can't get it to render anything or render in and out, cant get it to relocate the files, or render the project. Thank you for the help - Win 10. All drivers are updated.
As for the old preview files, you can delete/disregard them. But you're saying that it won't allow you to create new render previews?
Might be worth clearing the media cache and letting that reload. If it's a large project it can take a little bit but it's not a bad spot of maintenance to do. If it still doesn't let you, maybe you can try copy and pasting everything into a new sequence (only issue with this is if you have something like audio tracks already automated or fx in the effects rack in the track mixer.)