Snipping tool problem

Hi, I have an issue with my snipping tool....It only works on a fresh
reboot..any time after that it will either have a dark (non transparent) grey
screen OR the screen shows my taskbar repeatedly (on the whole screen)
instead of the normal transparent screen....Using the screen capture button
and pasting it into Paint has the same affect...my screen capture would be my
taskbar repeated many, many times. I also beleive this has something to do
with my screen saver as when the screen saver comes on...I see my taskbar
ontop of my taskbar etc etc etc..

Thanks for your time!
Wayne