this works for windows xp (the only comp i got. it may work for others how the hell would i know?)
1) right click on the main desktop and select properties
2) click the settings tab
3) find the resolution button and slide to all the way to the left.
4) play rs. i recomend using the runescape client off the runescape website. swiftswitch utilities wont work with this.
before:

after:
