Smart BootManager

Vista refuse to boot if the Disk signature (NT Drive Serial Number) has
changed. But SBM modifies that four bytes of the MBR (at offsets 0x1B8 to
0x1BB).

So to install SBM and keep the possibility to boot Vista, we need to do the
following:
1) save the four bytes value (on paper for example);
2) install SBM;
3) restore the four bytes (and also set the preceding byte (0x1B7) to zero
to keep the "SBM Bad!" string ending -- the string does only looze the
CR-LF).

I've done that by using PTS Disk Editor on the Ultimate Boot CD, since
between step 2 and 3 you cannot boot Vista (and also because SBM is
installable from that same CD)