Can't install Vista

I had Vista Ultimate x64 installed on my machines, and wanted to install the x86. But, when I tried to install the x86 after deleting the x64 version, I now get an error that says that "Windows is unable to find a system volume that meets its criteria for installation." I have reformatted the drive and all else that I can think of, but, it it continues to throw the error message. What should I do? I am sure that my system and hardware is sufficient to handle the Vista install, and I am trying to install to the same drive that I had the other installed to:
Processor
2.00 gigahertz AMD 64 Opteron's (2 installed)
Main Circuit Board
Tyan Tiger K8WE
Memory Modules
2 GB RAM

I don't understand what the problem is and I hope someone here can help.

Jan :)

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