Access denied for optical drive and other removeable disk (USB)

I am using Windows 7, Enterprise, 32-bit OS. It's Dell E5400 notebook. My machine for sometime was a part of a domain. Now I have changed from Domain to Work group. I don't know what went wrong, but I cannot access neither optical drive nor pen drive at usb.

I went for take ownership at security tab at their properties. But there was not security tab there. I formatted my pen drive with NTFS file system and found security tab. But no use. I cannot take ownership. I am getting these errors : “an error occurred while applying security information to: :F" and “access is denied”

I went in safe mode. Everything was accessible there. From safe mode, I tried to give permission to "administrators" including my user account, but same error occurred.

Please help me.