After some month and some hardware changes I decided to reinstall Vista64.
Tried to boot from DVD in a SH-S223Q SB03 fully patched, and Setup didn't start.
Several tests with other SH-S223Q / SH-S223F and other original Vista64 DVDs... no boot
Tried SH-S202... DVD starts
Tried Nec 7200 / LG GH22LS... DVD starts
Tried above SH-S223(F/Q)s with burned copy of above original Vista64 DVDs:
--> Installation starts!!!
Does SH-S223(F/Q)s have generally problems with boot from original DVD-ROMs? (Tried three drives!!!)