Thanks, Guys. I'll check my video drivers & try a couple of different resolution settings. I've just purchased & installed Windows 7 on a new machine in the last week, & have gone through plenty of updates. But there may be a conflict with the resolution.
One interesting fact: if I position my icons (using snap to grid) & simply restart Windows, then everything stays put. But if I turn the machine off, when it boots up again, the icons are all repositioned in a default manner, alphabetically.
This last bit I just discovered today by accident. And it makes me think that my overall setup may be influencing Windows. I'm running Windows 7 on an iMac, using Parallels.
Parallels has not gotten in the way of any of my other Windows operations so far or given me any trouble with my other software, so I didn't give it much thought. But it may be doing something in the start up that pushes Windows to a default setting.
Thanks for taking the time to kick this around. I'll post my results.