It's bad RAM, I think. Where does the error come up? At first boot, or during the actual installation program?
If there is more than on stick of RAM in the machine, try taking one out an trying again. Do the same for the other stick(s) if it still doesn't work.
There is a Memory Check program that some distros include on their startup disk (I think SuSE used to, at least for 7.3). Try that.