jimn5dc,
For the future, you will probably get better answers to questions like this in forum602 or forum751.
You will need to re-install Windows with the RAID drivers, so back up your data before you do anything. Then, insert the MB CD or go to ECS support site and get the RAID drivers to install into Windows. You will need a formatted floppy disk. Many MB CDs have a "MakeDisk" utility that will load the drivers onto a floppy for you.
To create the array, first enable RAID in the BIOS. Upon next boot, in sys BIOS, you will see a prompt to enter RAID BIOS, CTRL+L or the like. Do this. It will give you an option to create an array, select RAID 1, select drives, and exit. All data will be lost. Next, set RAID array in Boot Menu under Hard disk options to be the booting drive. Make sure CD-ROM is in the boot list if you want to re-load Windows.
When you boot to CD to install Windows, use a wired keyboard and start tapping F6 as soon as Windows starts installing. You can stop when the F6 prompt disappears. You will be asked for those drivers twice during the install, just follow the instructions.
Best of luck!
Tony