Hi, I have a nvidia geforce4 ti4600 and I run dual monitors. when I enable both monitors and right click on any thumbnailable file (mpg,jpeg,avi,etc) my viewsonic monitor clicks off and then instantly back on. I reinstalled the newest video drivers and I have XP sp2 all the updates. I also tried to switched the monitors on the video card. (one uses a dvi-vga adaptor) the output doesn't matter. the monitors don't have anyproblem when used singly or in clone view, only when they are separated.