Could you please try a simple change in sardu configuration file? It would be interesting to know if it works.
First, it's important to stay at Syslinux 4.x (its called "isolinux" in USB Menu).
now edit the following file: [SARDU-Drive]:\SARDU\pe.cfg
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#Install di Win 7
label ... (language dependent)
menu ... (language dependent)
MENU INDENT 1
COM32 /chain.c32
APPEND boot ntldr=/bootmgr
and replace last line by this: APPEND fs ntldr=/bootmgr