http://www.mydigitallife.info/how-to-backup-and-re store-windows-7-and-server-2008-r2-activation-stat us-activate-offline-on-reinstall/
Copy and save or backup the following activation-related files to external storage medium such as USB flash drive or portable hard disk drive:
%SystemDrive%\Windows\ServiceProfiles\NetWorkServi ce\
AppData\Roaming\Microsoft\SoftwarePlatform\Tokens. dat
and,
%SystemDrive%\Windows\System32\spp\tokens\pkeyconf ig\pkeyconfig.xrm-ms
Note: For 64-bit (x64) OS, %SystemDrive%\Windows\SysWOW64\spp\tokens\pkeyconf ig\pkeyconfig.xrm-ms have to be backed up too.
potrebujes ale aj ten OEM product key (bod 2), ten by mal byt stejny pre vsetky vyrobky daneho OEM vyrobcu, to zhlavy neviem nabeton u Win7 ci je mozne alebo nutne tam dat ten z nalepky alebo OEM kluc pri SLIC2.1 aktivacii. U starisch Win bol jeden Royalty OEM key spolocny pre vsetky vyrobky daneho vyrobcu.