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#11
It was some time ago now but, from memory:-
You will need to do a custom install and on that screen there is an option to load other drivers. These can be loaded from a CD or a memory stick so before you start the install you need to download the raid drivers (64 bit versions) and put them on a CD or memory stick.
You can't do an upgrade from 32 bit to 64 bit so make sure you have all the drivers you may need before you start.