Hello Squashman and thanks for the reply,
Every Windows OS has a subfolder "ReinstallBackups" for drivers rollback. As time goes and hardware changes this folder can be full of unneeded files. If OS is stable, this folder can be empty.
On x86, it is located at %SystemRoot%\system32\ReinstallBackups; On a x64 I'm not sure where it could be; the same happens with Windows 7 and 8.
