I was using a Sony Laptop which crashed with a Graphic Card failure. Then I bought a another used Toshiba Laptop from a friend and replaced the hard disk from the hard disk from Sony Laptop.
It worked fine without any modifications. All the software worked in the Toshiba Laptop.
Now, since past few days, I am get the message saying that, Windows did not pass the validation test.
I have the genuine Windows Vista OS and the Product key, but I am using the hard disk in another Laptop.
Please let me how I can resolve this issue.