After running "full optimization", it was not possible to start the PC again. BIOS could not find HHD. Nor was it possible to load Win7 on this HHD again.
Even after installation Win7 on another HHD, and connected to this HHD it was not possible to find HHD.
If HHD was connected to the PC during startup would not start the PC, although new Win7 was on an other HHD.
I have thus now two HHD as I do not get used to anything.