You basically plug in the IDE cable, probably want to put it in the middle of the cable if its going to be the slave. Plug in the power cable. Make sure the jumper shunt is set to either Cable select or slave (since its in the middle of the IDE cable, either one is fine). Plug a power cable (it will have red, yellow and black into the corresponding slot on the Hard-Drive. Boot up your computer, go into the BIOS, have the BIOS autoselect the settings on your primary slave drive, save the bios settings and boot up windows. There shouldn't be any software you have to install.
Make sure your Motherboard can handle the harddrive size you want to buy. This probably won't be a problem unless your computer is ancient.
-=-=-=-=-=-=-=
-Dan
My brain is cold stew