I have an old version (4.2 - hey, it suits my minimal needs

When I begin the program, the Choose Database window opens. MySQL status is Started. The error window is: "Database not present. Could not establish connection". I tried restarting MySQL (version 5.1), re-booting, changing other things, etc. - still the same error. I compared the file folders to another computer with functioning software and it appears that all the same files are present.
What could the problem be? Thank you for the help.
M