Rotated monitor help!

[lbeckm3]

I've started to build a small bartop cabinet with an old pc and an 18" monitor.  I want to rotate the monitor so I can play old-school Donkey Kong, Pacman etc. on it and I'm having screen rotation issues.

With Maximus Arcade do I;
1. Rotate the theme and set flags on mame launch to rotate games. (thinking maybe this is what most do?).  Just got the theme editor open now and digging through it.
2. Rotate Windows XP through the graphics card options. (when I launch games after doing this - they are really really skinny and tall taking up less then 1/2 the screen width wise).

Anyone else out there with a bartop with this orientation, or a cocktail lcd setup like this?

Thanks!!

FYI - I'm after basically this: https://forum.arcadecontrols.com/index.php?topic=123302.0

[Caparo8bit]

IMA NOOB AND IF YOUR USING MAME YOU CAN ROTATE THE SCREEN   :   SELECET GAME  WHEN GAME IS LOADING PRESS TAP ON PC AND THAT BRINGS MAME MENU THEN GO TO VIDEO AND WALLAAAAAA....... (THI IS ONLY FOR MAME MEULATOR) HOPE HELPS YOU