Core2 - x86-64 install errors

["Collen Blijenberg <MLHJ>" <systeembeheer hermanjordan nl>]

I'm trying to install the core2 version for my
amd-64 processor. but the installer/anacon keeps on
crashing...!!
most of the times it happens, after i'm finished with the package
selection...
it will not format my partitions, and gives errors, saying that he
can't find the selected package's...
i tryed all diferend kind of things, but it's not instalable by me !!

anny sugestions, or fixes ??

greets.
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Collen Blijenberg (Systeem/Netwerk Beheerder)

Montessori Lyceum 
Herman Jordan
Zeist