missing 1920x1080 resolution

OK, same problem, purchased a larger monitor... LG 32 MP58, pop-up said, recommended setting, 1920 x 1080
so, I set that
but, playing with the settings in windows settings, selected "detect...
"
resolution not as clear and now the 1920 x 1080 option is gone from the list...
 

My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
PoweSpec B409
OS
Windows 7 Home Premium x64
CPU
Intel(R) Core(TM) 2 Quad CPU Q830
Graphics Card(s)
Intel (R) G33/G31 Express Chipset family
Antivirus
MS Security Essentials
Browser
FireFox
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