Hi scansoft
Unless your Bios has an option to allow you to boot from SATA and select the SATA drive then I'm afraid
you will have to re-install Win 7 on your IDE HDD and use the SATA drive for storage. If you are able to select the SATA drive in the Bios you should be able to move it into the 1st Boot device. Hope this is of some help, but I am not familiar with Compaq PCs but most Bioses of the past few years allow boot selection.
Stransky
(Douglas B)