[H] RAID 0 Question..

[Scoobydo]

I have a two drive RAID 0 array which is working well for me so far. I  
have purchased another identical drive from Ebay and it should be here  
early next week. Am I correct in assuming that I will have to re-install  
Windows when I add my third drive?

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Main Machine:
Generic Steel Case
ASUS M4A89GTD Pro/USB3 Mobo
AMD Phenom II X6 1055T (Default speed)
OCZ DDR3 1333 (2x2=4)
Palit GTX460 1 Gig (OC'd to 865 MHz)
WD Cariar Black 640 Gig
Lite On 22X DVD Burner
ASUS 21.5" 1080P Monitor
fold...@home (11,000 PPD)

Game Box:
Cooler Master CM690 Mid-Tower
Gigabyte 785G/SB710
AMD Phenom II X2 555 C3
Corsair Dominator RAM 2 gigs
PowerColor HD5770 1 gig
Seasonic 550 watt PSU
2 Seagate 7200.12 500 gig (RAID 0)
LiteOn DVD Burner