The default settings are cashier id: 01 and password: admin
If you changed them, you need to used the changed ones.
If you backed up your database before the re-install, then you should not choose to KEEP EXISTING DATABASE, but rather create a new one. This will let you into the software with the default settings. Then you can restore the backup by using the default password: admin. The database should be named 'cresql' unless you have a different name for it.
However, once restored, you will still need the changed password to open and run the software. If you don't have it, it can only be changed by programming a new one into the database directly with other software. Technically difficult. If you need help,
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