The specified folder could not be deleted either because the media is write-protected, or the media is full, so it can't be saved in the recycle bin.
The disk may be full or has too little free space to perform the desired operation. To get additional space:
Several software products that can help clean and remove unneeded files are Fix-It Utilities Professional and SystemSuite Professional. If you need to move or copy a partition or entire drive, you could use Partition Commander or similar product.
To proceed with actions on the file or folder, the application using it must release it. Either save or close the open file.
If you continue to get a warning, try closing the open application.
If you had an application crash since powering on, Windows may think a file is still in use, when it no longer is. A reboot should clear the issue.
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