Display driver is certainly not the case (and is up to date). Because then it should also do this in other programs and it's only within Word/Outlook (and not in Excel).
Printer driver is ruled out since i don't have one installed 'cause simply i don't have a printer.

The option: 'optimize character positioning for layout rather than readability' was unchecked but checking it didn't do anything, unchecking again same result.

Still on the lookout for a solution...