What is the size of the monitor?
I've seen posted every once in awhile the bottom limit for resoulution where WB will work. Maybe some one will come along who knows what is and reply.
For DPI settings right click on the desktop and bring up Properties, click on Setting and select Advanced. Under the General Tab what does it show the DPI set at?
EDIT: Okay, just checed and your resolution is set at the minimum. Normal DPI is 96