When you open My Computer window, one or more of the disk drives may be assigned an incorrect or a generic Windows icon (unknown file type icon) rather than disk drive symbol.
This happens due to any of the following reasons:
Presence of the file named Autorun.inf in the Drive's root folder (say C:\ )
Uninstallation of a third-party theme or an icon library has failed to remove the drive icon settings in the registry
RESOLUTION
Enable Windows to Show all files and then locate the file Autorun.inf and delete it from the root folder. Restart Windows.
If that does not help, try this:
Open Registry Editor (Regedit.exe) and navigate to the following location:
HKEY_LOCAL_MACHINE \SOFTWARE \Microsoft \Windows
\CurrentVersion \Explorer \DriveIcons \<drive>
Example:
HKEY_LOCAL_MACHINE \SOFTWARE \Microsoft \Windows \CurrentVersion \Explorer \DriveIcons \C
Backup the key by exporting it as a REG file. See here for more information.
After backing up the key, delete the <drive> key from the registry.
Navigate to the following key, backup and delete the <drive> key:
HKEY_CLASSES_ROOT \Applications \explorer.exe \ Drives
\<drive>
Close Registry Editor and restart Windows.
