Lgon failed. Unexpected error from external database driver

After a Windows 10 update I had errors running reports. I use Excel 2003 files and Crystal 2008 on a standalone PC.

So I took the opportunity to install Crystal 2016. A new install (though the original is still on the PC.

I get the same error - whether connecting to an existing file or a new one (.xls and .xlsx).

"Logon failed.

Details DAO Error Code 0xccb.

Source DAO Workspace.

Description: Unexpected error from external database driver (1)."

I am not an IT professional, but have used Crystal for years.

Any simple to understand advice would be very welcome as I have just spent a LOT of money on the upgrade.