When the Vista Loader — also known as SoftMod or OEM BIOS emulation — is installed in a system with multiple Windows installations, Windows probably won't boot except the one in the first NTFS partition because the Grub4Dos code in the grldr file installed by the Vista Loader by default boots the first NTFS partition. In this case, you should uninstall Vista Loader from every Windows partition and then reinstall Vista Loader into a separate FAT logical partition. GRUB4DOS or pure GRUB will be used to load OEM BIOS emulation code into memory and then execute instructions in the menu.lst file to boot Windows in NTFS primary partitions.
To use multiple Windows installation, Grub4Dos and Vista Loader should be used together. This duo can be installed on a floppy or a bootable USB flash. The following is the contents of a menu.lst file used with Vista Loader.
timeout 0
default 0
fallback 1
title Vista Loader
map --mem (hd0,0)/vstaldr.img (fd0)
map --hook
chainloader (fd0)+1
rootverify (fd0)
title Windows Vista
find --set-root /bootmgr
chainloader /bootmgr
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