When I try to save a file, an “Error typing” error appears.

You must change the format Windows uses to display numbers. Point (not comma) must be used for decimal numbers. You can change the number format in Windows:

• Open Region and Language by clicking the Start button , clicking Control Panel, clicking Clock, Language, and Region, and then clicking Region and Language.
• Click the Formats tab, and then, in the Format list, click on “Additional configuration” and then select (or type) the decimal symbol to point.