On a customer machine, It is possible at startup to double click an icon and hane the program or the program associated with the file type lanuch; however after a few minutes, the icons become unresponsive. The start menu still works correctly. I don't know if it is related, but the touch screen does not work with the desktop icons. The touch screen works with the Start menu.
The OS is WIndows 7 Home Premium.
The only procedure I could find was to delete iconcache.db and reboot. Of course the icons functioned after the reboot, but they stopped working after a few minutes.
What would cause this behavior, and what do I need to do to correct it?