I re-install Operating system on Multiple pcs in a month to repair multiple issues. Most of these systems are HP/Dell/Ace/emachines. Most of these have a COA sticker of XP, while the operating system installed is Vista or 7.
Before I re-install, I extract their keys, and then use OEM cd to reinstall the OS, only to later find out that OS key is inavlid for activation.
I would like to know if there is a way to verify if these keys are valid for activation/or genuine without Installing anything on the PC in questions. FOR EXAMPLE, If i could install something on my machine and then input these keys as they come in... so I don't wipe everything clean to figure out they were using Hacked/illegal software.
This is very Legal/legitimate question. I want to use their existing LEGAL only keys to reinstall their OS, but would like to make sure these are legitimate keys before I wipe their hard drives.
Please let me know what solutions you have available.