It's a NOS brand kit includes Bottle, bottle mounts, supply line, solenoids, new micro switch, new relay and wiring kit, owners manual, 75-125 jets. ALSO includes PURGE kit ($95 Value), dump tube for tank, and pressure gauge. Simple install on any 4 or 6 cylinder. My question is will i need anything other than this to get it going? Do i need new ignition or anything like that? also is install hard?

Well, since you said "solenoids" (plural) I'm guessing you bought a wet system. Installation is pretty easy. Just mount the bottle (nozzle facing forward if possible) and run the nitrous line to the engine bay, pull your schrader valve out of the fuel rail(you'll need a valve stem puller), drill a small hole in your intake for the fogger nozzle, mount & wire solenoids, switch, etc.

will i need to upgrade my ingnition, fuel pump, or anything? or decrease timing?

also i heard i need a window switch? to cut off nos flow so that rev limiter doesn't hit and cut the spark and blow my engine. Will a window switch work with a NOS brand nitrous system. also where can i get one

Our engines are set up to handle a small shot without any mods. 75 is about the max shot to run though, so you might want to order some smaller jets. Since you're running a wet system (gas and nitrous) you don't need any fuel upgrades.

A window switch is good idea. You can order one from NOS.