<p>I bought Windows 7 Ultimate from eBay around 8 months back. I got original Microsoft DVDs (for 32 and 64 bit) product sheet. To verify the genuinness, I activated the windows immediately after installation. It got successfully activated.</p>
<p>After that, I used Microsoft’s online genuine windows check and it was also successful. Everything was working fine since last month. Windows updates were regularly taking place. Then one fine day, I got blackground and a message telling me that my Windows is not genuine. I discussed with friends and they suggested to re-install it.</p>
<p>Today I re-installed the windows and tried to activate it. I gor the message</p>
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<p>Your Windows Product Key is blocked by the activation server.</p>
<p>What is the solution for this problem? If my windows were nor genuine, how come it worked properly for around seven months? Shall I contact Microsoft for the same? I don’t know where to contact Microsoft.</p>