I am pretty sure that there isn't any corruption with the plugin as the text is correct, albeit in the wrong font.
You could run
System Files - SFC Command - Vista Forums (where this refers to a Vista disk, obivously substitute your Windows 7 disk) to see if this picks up anything.
The other option is to change your theme to see if that makes a difference (I know that you have already dismissed this, but it is still worth a try).