@occhio, IMO, this does not necessarily point to any problem with your optical drive but to a problem with your Windows 7 installation.
Try doing a repair install Repair Install
and then try to make your repair disk.
EDIT: I missed it - that yours is a laptop and you may not have the OEM Reinstall Disk.
Have you made the recovery disks?
Is there an option to repair Windows from the recovery partition as in a Repair install?
When the OEM has provided you System Recovery Options by way of the recovery partition and Recovery Disks, why do you need a System Repair Disk?
I am not sure whether it can even be made on a laptop with OEM installation.