The decimal symbol (for numbers and currency) should be a period, not a comma. This causes an astonishing number of problems for South Africans - for example, if you try to create a CSV file in Excel, it uses semi-colon as the separator, which doesn't work with anything. It breaks integration with a lot of software and is causing a great deal of confusion.
I know this is a simple thing for me to change, but Microsoft need to fix this for the entire country.