It's normal to get a fixed refresh rate at perticular resolution and as 6600GT is quiet outdated card it wont support high refresh rate at high resolutions .There is no problem with your monitor but you need to get a new graphic card to get higher refresh rates.
Developers
WAIK (Windows Automated Installation Kit)
Dreamweaver(trial)
System
Vista service pack 1 (vista SP 1)please MANY vista users will need this !:-P
Multimedia
Adobe Photoshop CS3 Extended(trial)
Games
2-3 NICE Free Or Trial (NO Demo) RPG or FPS Games
MODs of Max payne 2:D
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