I guess I'm out of luck.. The font is indeed RGB 40, 40, 40. There are only two 40, 40, 40, texts in my theme, neither of which is related to what I'm looking for. 
Thanks for your help

No luck yet... Any more specific suggestions for 2) ?

Thanks

In some cases, as in task manager (screenshot below), the highlighted text is black. How can I change it?


In Windows Media Player 12 Find Album Info window most texts are too dark. The background color is the same as the Window background color, but the text is not the same as the Window Text color. How can I change it?


Thanks

Yes, that' the one. Thanks a lot  8)

How do I change the black background shown in this screenshot?


Thanks

Thanks a lot 

I was afraid of that.. 
Could you then tell me how to change the background color? Hope it's not Windows Background..
Thanks

Could someone help me find the text color that is not visible against a black background as shown in the screenshot?
Thanks