Like we said, there are two possibilities of a faked winver. 1. Changed winver on the pc with a "trick" 2. Used Photoshop to fake the pic
Please note that force-changing winver from 6.1.7600 to something like 7.0.7600 MAY lead to serious problems with software/drivers that performs a version check before installing (and doesn't know something like 7.0 of 7.1 because such a thing doesn't exist (yet)).
You can try yamicsoft windows 7 manager.Under CUSTOMIZATION go to CUSTOMIZE SYSTEM.Look on system and you will version and build number.Change the two values to whatever you wish,save and reboot.Try and post result