Hi there,
You should be able to remove the shadows by right-clicking on This PC and selecting "Properties" and in "Advanced System Settings"
Click "Setting" on the "Performance" box of the window that opens. You should see a selection for "Drop Shadows" at or near the bottom of the list.
You can also edit the registry to get this sorted. Navigate to the following key:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
-Double click on the ListviewShadow option.
-Change the value of ListviewShadow 1 to 0 to disable the shadow effect
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