I've set up a Windows 7 guest machine under Windows 7 using oracle virtualbox 4.2. This Windows Guest has its own product key which corresponds to the boxed set I purchased for the sole purpose of running it in virtualbox. A few months ago I backed up my Windows 7 virtual box virtual disk image on an external hard drive. Now that the Windows 7 started to malfunction, I deleted it, and copied it back from my external hard drive.
However now it's telling me that the version of windows is not genuine. How can it be. There is nothing else using the same product key, unless someone hacked into my backup folders and stole the protuct key from there and used it on a machine of their own.
Thanks.