First, I don't think you will get many bites on people that will do anything for you, myself included. I am here to help people with their problems and work through it with them...not to do peoples work for them.
Secondly, you should be able to do this by making calls to the Windows API's: GetDCEx and GetCursorPos (I saw a C++ article that used these awhile ago, but that app worked like a color picker (think Eye dropper in Photoshop) thus it required the user to click for the pixel color to be obtained.)
You may want to check out this link though: http://www.tutorials-se.com/drawing/COLOR-under/
I will only tell you how to do it, not do it for you.
Unless, of course, you want to hire me to do work for you.
Read this if you want to know how to get a correct reply for your question:
^^Took that from planoie's profile^^
^^Modified text taken from gbianchi profile^^