how can i prevent updatin i586 packages on my system?

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http://forums.fedoraforum.org – I have an Aldi PC with a Q8200 processor and have installed Fedora11 on this system. Regularly I get updates to install, but also updates for i586 packages, which give a conflict with the x86_64 packages already installed. Sometimes I have missed a i586 package in the update list, resulting in an error next time. Is there a script which automatically filters these i586 packages from the update list? Thanks in advance, Peter (HowTos)