Norton Power Eraser Catastrophic Failure Error Code 0x8000ffff,n5

Hi,
I have up to date Norton Internet Security 2011 running on my laptop,it doesn't detect any virus on my laptop that's why I downloaded Norton power eraser to be sure that my laptop is secure and that everything is going well but when I downloaded Norton power eraser and started to scan I found an error message telling me Catastrophic Failure Error Code: 0x8000ffff,n5
My laptop is Acer Aspire 5538G running Windows 7 Home Premium.
I would be appreciated If anyone Can help me :smileyhappy: