Error installing MSDN april 2003

It keeps saying (when installing MSDN):
"Error 1308.Source file not found: C:\1\Program Files\MSDN\2003APR\1033\<name of file>.hxs. Verify that the file exists and that you can access it."

Well the <name of file> (there's lots of them) are there, however they are named .hxi instead of .hxs, wondering if anyone else has come accross this? I've searched here and google but to no avail.