First I install OS in one machine & default software if required than i will create one Ghost Image of that machine than I will make 49 copies of that Ghost Image DVD & run on all ramain PC, but for this you should be have ghost software & knowledge of ghost( how to make Ghost bootable DVD/CD & how to use that ) this is a 1 solution another is given below -

Installing over Network

Here You have to build one distribution server & copy OS's i386 on Distribution Server & install the network client - this software allows the target computer to connect to distribution server .

The setup programme copies installation files to target computer & creates set up boot disk. After setup copy installation files you start the installation from set up boot disk.