Windows Vista Validates on the Microsoft Windows website but the activation code is rejected as inco

I recently had to format my main hard drive and re-install windows due to a corrupt program that I could not uninstall.I tried to install Windows XP Professional first but it could not validate so I installed Vista Home Ultimate.Windows would only install if I did not enter the activation code.Once installed Vista was validated on the Windows website but the activation code keeps being refused saying I need to check that I entered it properly.Both my Windows programs are OEM but they were bought with the pc which I had built as a dual boot computer.Before anyone jumps in and says that my Windows disks are forgeries they were both in use from the time I bought the pc and validated and activated with no problem before.I cannot afford to buy windows 7 or 8 as I am unemployed and I need my pc for so many reasons.Can anyone please help me as I am seriously thinking that Microsoft has deliberately revoked the licences of Windows before 7 to make people buy a new operating system, one I do not need.

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