Instead of reinstalling 2018, consider upgrading to:

While QuickBooks Desktop Pro 2018 is a robust tool, the lack of security updates makes it a risk for businesses handling sensitive customer information. If you find that the 2018 version no longer meets your needs due to the lack of bank feeds or payroll, you may want to consider:

If you are reinstalling QuickBooks Pro 2018 to recover old data, do not try to open the file immediately.