It appears to be a Western Digital drive the same as mine... ;-) anyway, it seems as if you did it right. If you booted up Windows from the working drive and only had the working drive connected, that's the first step. Secondly you set the failing HD as slave and connect as slave and boot Windows. It should NOT cause it to stop booting Windows, it should simply carry on as normal and detect the failing one as a second drive - unless the boot sequence looks for the failing drive first. If it still tries to boot from the failing slave drive, go into the BIOS (tap DEL or whatever key it tells you to press on startup) and the BIOS menu will come up. Go through the menus and look for the Boot Sequence option (it's usually in the second one down bt it varies on different boards). Then make sure the boot sequence is set as Floppy, CD-ROM, HDD-0. If it has HDD-1 in it, there's your problem. If it already has HDD-0, change it to HDD-1 and try it. If all this fails, then it looks like the drive has failed.