Hi, I'm fairly new to the linux world. I recently installed backtrack 4 final on my usb flash drive. I formatted it to fat32 and copied the files to my flash drive using unetbootin. My only problem is that it will not boot when I restart. I have grub installed and I'm dual booting with vista home premium and ubuntu intrepid. I heard that it's most likely a faulty mbr and that I need to install one on my flash drive. I followed the directions via this link below, yet when I reboot, I still get the grub menu with the dual boot options. Help would be greatly appreciated. Thanks.

note: I noticed I can't post links