There are two reasons for what you see.
One is the menu item text color and the other is the use of ClearType. Any toolbar masquerading as a menu (as all those shown are) will manifest this problem.
In SkinStudio, go to Controls/Menus/Bar items - toolbar like. Change the text color there to black. Do the same thing for Controls/Menus/Bar Items. Save & re-apply the skin to see the change & test a few menus.
The ClearType issue is tougher to deal with in a skin with a light color menu mouseover graphic - the ghost color is taken from the regular Windows Highlight Color. Your choices are to turn off ClearType or change the Highlight Color to something that more closely matches the mouseover graphic color of the menuitem - then it will still be there but you won't "see" it. A very light color highlight on a white background can be a problem, though, particularly with white highlight text, so you kind of have to live with one or the other.
There is a good blog by Adam Namanowicz here on WC titled something like "10 things to check before uploading your skin" that goes into more detail on this if you need further help.
