Hi, AMD processors: Athlon, Duron are x86. If u r using Opteron or AMD64 (is this out), they are 64 bit versions and u hav to see if there is a version that supports them. They have 32 bit compatibility mode which can be used. I am not sure abt the technical details of setting the mode. HTH, Sanjay (If anyone can give me information on setting the mode, that would be nice)