See if you can delete the folder using KillBox:
Download
KillBox
Unzip the folder to your desktop.
Start Killbox.exe
When it is open, enter
G:\Graphics\whatevername into the field labeled
"Full path of file to delete".
Select the
Delete on reboot option.
Then press the button that looks like a red circle with a white X in it.
Your computer will reboot and check to see if the file is gone.
Let us know if this works