Thank you so much, I tried the instructions and they helped a lot. Although, the bottom-right area of the screen is still a bit unresponsive, the re-calibration did improve the general accuracy of the on-screen buttons.
I found when performing the tracing of the 'white-box', I used a straight-edge. ie, ruler, side of an envelope, or whatever ...to guide my stylus when tracing the left and right vertical sides of the box. This assists in making a straight up/down line , since it's not recommended to use the the physical edge of the screen when tracing that part of the box.