Metatrader 4 vs Metatrader 5!

Still using MT4 and honestly don't see reasons to leave my confort zone.

regarding Ninjatrader, I've tried and didn't like it. MT4 is the way I go.

I started use metatrader 5 on January 2012. I have open two chart - Eur/Usd.
First window Eur/usd - 1 hour timeframe
Second window Eur/usd - 4 hour timeframe

Overall, it is easier to see. Control indicators is also excellent divided :
- Oscilator
- Volume
- Bill Williams

Is meta trader 4 or meta trader 5 compatible with Windows 8? Some one told me 4 isn't and 5 is. I'm having trouble with 4 computer is bran new but when I try to open mt4 it opens but then closes right away. If 5 is not which platforms are? Total knob when it comes to computers, so I would appreciate any help. Thanks in advance

I haven't traded since around 2009. I've been copying and pasting all my old indicators and eas from back then into mt4 and they don't seem to be showing up. They no longer work?