Upgrade to Memory requires re-activation of Windows

Strange issue.

My LapTop (Vista Professional) has 2 X 512 Mb Memory sticks. I replaced one of them with a 2Gb stick. On re-starting Windows it is now asking me to activate Windows. When I do, it says that activation has failed because the product key is in use, also, Windows Security Essentials tells me that I've failed the 'Genuine Windows Test' and will close in 30 days.

If I remove the 2Gb stick and put the old 512Mb back in I don't get the messages.

I have the original CD and Product Key (and they are both genuine)

Any ideas ?

Not sure if this would help?

Edit:

I also read this which, might work.

Quote:

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Originally Posted by theabovelink

For hardcore system enthusiasts, keeping a ghosted, activated copy of Vista with no drivers could be a good way of being able to swap around components and machines with the minimum amount of hassle.

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all you have to do is call the activation hotline.

Quote:

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Originally Posted by Lord Orwell

all you have to do is call the activation hotline.

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Yeah, I'd suggest the same thing... It takes only few minutes.