When using the switches on AWC card to force Adept Windows (or terminal, or VGB). It does disable the auto boot. You should be getting a prompt asking for the boot drive. Normally this is 'D' for the hard drive ('C' if an older SIO based system, but Staubli never build a CS7B with SIO), 'B' for the optional floppy, or 'X' for network. I am assuming you are typing in 'D' and it is not working. Hopefully you have a floppy disk, CD, or folder on your PC with a bootable image of V+. If it is on a floppy and you have the optional floppy disk drive, put it in and answer 'B' on boot up. If you don't have an floppy disk drive (it was an option), then you need to do a network boot. Starting Adept Windows also starts a TFTP server (trival FTP). Answer X on boot up, it will ask for the IP adress of your PC and drive and directory where the bootable image is.
If this does not work or you don't have a bootable image, you will most likely have to contact Staubli service and send the AWC in for diagnose, repair, and to reload V+.