You can't see a Raid controller because your motherboard doesn't have one. You are using an inexpensive motherboard; therefore you can't expect features like a Raid controller.
Unfortunately Windows XP doesn't support software Raid, but you can read http://www.vttoth.com/mirror.htm
as it might be of interest to you. Make sure that you have a good backup just in case you make an error.
If you really want to setup a Raid1, you should probably buy an inexpensive Raid controller like this one (assuming that you can only use a PCI controller): http://www.newegg.com/Product/Product.aspx?Item=N82E16816318002&cm_re=raid_controller-_-16-318-002-_-Product
I would definitely make sure that it can support 1.5TB disk drives.