Modern M/boards should recognise SATA as a boot drive. You may need to update your BIOS though - fairly easy but don't do it unless you have to, very rare but it can go wrong. Windows will probably load drivers but they are not necessary to load windows as this would be a bit of a catch 22 situation if your new system only had SATA drive.
I would load windows onto the SATA drive anyway if it has better specs than your Raid as this is where your swap file will go. Is the Raid IDE or SCSI?
If it wasn\'t for Electricians you would be using your computer by candle light
Athlon 64 3500+
ASUS A8V-E Deluxe Motherboard
2x512MB 400MHz DDR Dual Channel
Gigabyte X800XL - 256MB Mem
Maxtor Y160M0 - 160GB SATA
Maxtor 80GB PATA
Xaser III Case
Win XP Pro SP2
ViewSonic VX924 19\"LCD 4mS(ish)