New HDD "Windows not Genuine"

I had a dying hard drive (C) , so I added a new second drive (D), installed Win 7 on it, and transferred data from C to D. I then pulled C and plugged D in where C was before. After repairing the MBR everything worked fine for a few weeks until I received a "This copy of Windows is not genuine" message. The Win 7 on D is the same original Win 7 that had been functional on C for nine months.

Should I simply re-enter the product key, or should I change the drive letter of this drive from D to C first, or is there something else that I may need to do?

Thanks,

Bob

Update:

The solution was easy. Here's what I did wrong, and finally right.

1. Wrong - When I initially received the black desktop screen and "Windows not genuine" message I went to the System panel and clicked "Change product key" which gave me the ability to re-enter the original product key. When I did that, it came back with a "Windows Not Genuine" message.
2. Right - Above the Change Product Key line was another line to Activate. I clicked on that link and saw a Windows Not Genuine message with a link to follow to resolve the problem. This took me to a link to Install the Windows Validation Tool. After I did that and let it validate, the warnings went away. I still had the black desktop, but that was a simple fix by re-installing the desktop wallpaper.

This line now shows "Windows is Activated."

nedinc said:

I had a dying hard drive (C) , so I added a new second drive (D), installed Win 7 on it, and transferred data from C to D. I then pulled C and plugged D in where C was before. After repairing the MBR everything worked fine for a few weeks until I received a "This copy of Windows is not genuine" message. The Win 7 on D is the same original Win 7 that had been functional on C for nine months.

Should I simply re-enter the product key, or should I change the drive letter of this drive from D to C first, or is there something else that I may need to do?

Thanks,

Bob

Welcome to SevenForums nedinc
Your win 7 install should be C drive. Maybe a repair install would fix that. Have you searched our tutorial section? Good luck to you with this problem.
Windows 7 - Tutorial Index
Repair Install

I dont think changing the drive letter will help in ths case you might need to do a win7 repair so it can correct the directory to the drive

if all else fails call ms and make them correct it from there home office ussually that stops the message when you install the same copy of windows on a new machine ms always questions why theere are two if the same os on two different machines persay

basicly sounds like ms put a block on your seriel thinking you have misused it
call them up -- follow there steps and it should be released and it will update

pretty simple but im sure ms has done this as i many times had to call them when i clean installed vista several times

it is a pain in the ass but im sure that is the solution let us know if it works

It might be as simple as having to Activate Windows 7 by Phone