There should be a menu button on your monitor. I don't know where, but when you press it, it should being up a menu on the monitor, not the computer OS itself (ie, the mouse will go behind it). From there, there should be an option to change the screen appearance. Move the horizontal position until it is right.
~Lordbob
My Computer
At a glance
Windows 7 Ultimate x64, Mint 9Intel i5-2500k2x 4Gb Corsair VENGEANCE DDR3-1600NVidia GeForce N260GTX Twin Frozr
Computer Manufacturer/Model Number
Hera
OS
Windows 7 Ultimate x64, Mint 9
CPU
Intel i5-2500k
Motherboard
ASUS P8P67 Pro
Memory
2x 4Gb Corsair VENGEANCE DDR3-1600
Graphics Card(s)
NVidia GeForce N260GTX Twin Frozr
Sound Card
Realtek HD OnBoard Audio
Monitor(s) Displays
ASUS 24" Monitor
Screen Resolution
1920x1080
Hard Drives
G.SKILL Phoenix Series 60GB SATA II MLC Internal Solid State Drive (SSD)
SAMSUNG Spinpoint F3R 1TB 7200 RPM 32MB Cache SATA II