First thing first, check that the jumper settings are correct.
There should only be one master and one slave.
Check the stickers on the hard disk for setting the jumpers to
master and slave.
The one using master jumper settings should be the one where
Windows is installed on.
Don't use the cable select option if it is given, this will give
problems.
Then get into BIOS (usually by pressing the Del button when it
boots up).
Set the first boot device to the hard disk where Windows has been
installed on.
Save the settings and restart the computer.
