Bootmgr missing

My computer locked up today and I had to restart it. Upon restart I got the error BOOTMGR is missing. I tried to repair using the windows disk but it states that it is unable to repair. What are my options?
Computer Specs:
Windows Vista 64
4 gigs ram
Raid 0 using on board controller (2 x 250 gig hdd)
Asus M2r32-MVP motherboard
Any help I can get would be greatly appreciated..
Thanks
Computer Specs:
Windows Vista 64
4 gigs ram
Raid 0 using on board controller (2 x 250 gig hdd)
Asus M2r32-MVP motherboard
Any help I can get would be greatly appreciated..
Thanks