There a lot of variables there. In normal Windows 7 you do not ever have to refresh the desktop. However, badly defragmented discs, poor video drivers (or a poor choice of resolution/refresh), an under-nourished system (lack of RAM, or a low setting for virtual memory), or some other app running can all affect the desktop negatively.
I run into issues sometimes, but they're understandable. For example, I swap USB drives a lot, and I have some icons on the desktop that point to apps on them. If the system boots and can't find the app (I've swapped the drive) then the icon will disappear, because it's no longer valid. Simply plugging the drive doesn't fix it, because I'm impatient, and don't let the full scan take place. A reboot fixes that. You might also see the same kind of thing happening to icons pointing to network resources. If the system is rebooted and the network resource isn't available, the icons won't appear correctly.
Computers...... huh?
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