This is an old and absolutely harmless bug in Windows.
To my great surprise I discovered that I have the same problem on my own Dell desktop.
I have therefore found and used this old Fixit (using IE) dating from 2011,
but which fixed the problem
and transformed my computer from "Laptop computer" into "Tower computer" :
On Windows 7 icons for WSD devices may show up incorrectly as a different class under Devices and Printers.
This article does not mention any side-effects of this bug, so this wrong icon
seems to be the only side-effect of this bug, limited to Devices and Printers.
If you don't like the icon that Windows assigns to your computer,
and frankly the "Tower computer" image that I now have looks more like an external hard disk, you could follow this advice :
Windows 7: Devices and Printers - Change Device Icons with Custom Icons.
My own recommendation is to leave this alone - the "Laptop computer" icon is much nicer.