Hey
@KE7, thanks for posting your question today and happy Friday!
To disconnect a computer from your Dropbox account, you can either
sign out of the Dropbox app or remove the computer from your connected devices, in your
security page.
You can safely delete the Dropbox files from that computer, once it's disconnected.
And to access your Dropbox files from your new computer, all you have to do is
download the app and sign in to your account.
Let me know if you have any questions.