This problem suddenly appeared after a Windows update. For years my desktop has been pretty stable, but after the latest Windows update the icons on my desktop randomly rearranged themselves each time I startup. This is very annoying, even though I have a utility that gives a "Restore Desktop Icon Layout" by right clicking the Recycle Bin. I have to do it 3 times to get it back to the way it was. I found a couple Registry Hacks that seem to work- time will tell- but I just don't see how Microsoft can't prevent this sort of foolishness.