Premiere encounters "serious error" - Media cache files on different computer?

Hi,

I recently lost both my computer and main external harddrive where I used to edit my projects. I could recover the project with my backup disc, but when opening the project on a new computer I get the message "The Media Cache directory " was not found or is not writeable. Hit OK to use the default cache location, or Cancel to exit Adobe Premiere Pro."

I did a manual search on my computer and backup external disc, but there are no cache files anywhere to be seen. Otherwise I could delete them and have Premiere create new ones - since I expect I set up the Media Cache directory to be stored on my old computer which got stolen. When in Premiere I try to go to Preferences to setup a new cache location but then I get the message "Sorry, a serious error has occured that requires Adobe Premiere Pro CC to shut down. We will attempt to save your current project."

Everything in the project looks the same - I could relocate all of my files and every timeline is there. BUT I can't play any files or sequences. All the clips are there, I can scroll through them, but I can't play anything. I can do exports that play just fine, though.

I can't import anything either. The box that says "Importing" shows up with a loading bar, but nothing happens even if I wait for hours.

WHAT is the problem and how can I fix it? I can't make any new preferences because the program crashes everytime I open Preferences. I don't know if it's the same version as on my old computer because that computer is lost. Please help!!! Thank you!