I am running WinXP pro on a AMD dual core Opteron processor 1212. I need to install MSXML 6.0 and there are four potential files options.

msxml6.msi
msxml6_ia64.msi
msxml6_SDK.msi
msxml6_x64.msi

I assume the 2 that have 64 in them are for 64 bit Windows and I have 32 bit. I don't know which of the other 2 is the right one?

Also there is a security update that has three potential files. Again, one looks like it is for 64 bit, but not sure about the other two:
msxml6-KB954459-enu-amd64.exe
msxml6-KB954459-enu-ia64.exe
msxml6-KB954459-enu-x86.exe. Can anyone help?