HOW TO CHANGE REGIONAL SETTINGS TO USE PERIOD INSTEAD OF COMMA, ON WINDOWS 7:
1) goto config screen
2) goto country and language tab
3) on the first tab, 'notations', click more settings (or extra settings whatever it's called)
4) on the first tab again, the first option you can change is called decimal sign. Change this from , to .
5) click apply
NOTE: just changing your reginal settings from whatever country you live in that uses comma, to UK will not work on windows 7