In some versions of Origin, on systems with a large number of Fonts, Greek characters may not display correctly. This Font uses the fact that Fonts are alphabetically sorted to insert itself early in the Font list.
In Windows, go to your Fonts Folder (Start : Settings : Control Panel) and Add the Font to your system.
In Origin, go to Tools : Options and click on the Text Fonts Tab. In the Text Tool section, select ASymbol as your Greek Font.