Try doing a clean installation of graphics driver. The option is available during the driver installation window.
I did bro... completely did it. there was no such option available during installation and moreover i even tried installing the drivers that came with the gpu.. but no luck.
do you think something is wrong with the gpu or the dvi --> vga converter.?? Any sure answers would be really helpful.!
i just found this on the release notes of driver version 331.82
"
GeForce 700, 600, 500, 400, 300, 200, 100, 9 Series, and 8 Series GPUs
This sections lists the supported display resolutions, color depths, and refresh rates for the products listed in “Supported NVIDIA Desktop Products†on page 40.
Standard Modes
640 x 480 8 60 70 72 75 85 100 120 140 144 150 170 200 240
720 x 480 8 60
720 x 576 8 50
800 x 600 8 60 70 72 75 85 100 120 140 144 150 170 200 240
1024 x 768 8 60 70 72 75 85 100 120 140 144 150 170 200 240
1152 x 864 8 60 70 72 75 85 100 120 140 144 150 170 200
1280 x 720 8 60
1280 x 768 8 60 70 72 75 85 100 120 140 144 150 170
1280 x 800 8 60 70 72 75 85 100 120 140 144 150 170
1280 x 960 8 60 70 72 75 85 100 120 140 144 150 170
1280 x 1024 8 60 70 72 75 85 100 120 140 144 150 170
1360 x 768 8 60 70 72 75 85 100 120 140 144 150 170
1600 x 900 8 60 70 72 75 85 100 120 140 144 150
1600 x 1024 8 60 70 72 75 85 100 120
1600 x 1200 8 60 70 72 75 85 100 120
1680 x 1050 8 60
1920 x 1080 8 60
1920 x 1200 8 60 70 72 75 85 100
1920 x 1440 8 60 70 72 75 85
2048 x 1536 8 60
------------------------------------------------------------------
640 x 480 16 60 70 72 75 85 100 120 140 144 150 170 200 240
720 x 480 16 60
720 x 576 16 50
800 x 600 16 60 70 72 75 85 100 120 140 144 150 170 200 240
1024 x 768 16 60 70 72 75 85 100 120 140 144 150 170 200 240
1152 x 864 16 60 70 72 75 85 100 120 140 144 150 170 200
1280 x 720 16 60
1280 x 768 16 60 70 72 75 85 100 120 140 144 150 170
1280 x 800 16 60 70 72 75 85 100 120 140 144 150 170
1280 x 960 16 60 70 72 75 85 100 120 140 144 150 170
1280 x 1024 16 60 70 72 75 85 100 120 140 144 150 170
1360 x 768 16 60 70 72 75 85 100 120 140 144 150 170
1600 x 900 16 60 70 72 75 85 100 120 140 144 150
1600 x 1024 16 60 70 72 75 85 100 120
1600 x 1200 16 60 70 72 75 85 100 120
1680 x 1050 16 60
1920 x 1080 16 60
Release 331 Graphics Drivers for Windows - Version 331.82 RN-W33182-01v01 | 56
Appendix A : MODE SUPPORT FOR WINDOWS
1920 x 1200 16 60 70 72 75 85 100
1920 x 1440 16 60 70 72 75 85
2048 x 1536 16 60
------------------------------------------------------------------
640 x 480 32 60 70 72 75 85 100 120 140 144 150 170 200 240
720 x 480 32 60
720 x 576 32 50
800 x 600 32 60 70 72 75 85 100 120 140 144 150 170 200 240
1024 x 768 32 60 70 72 75 85 100 120 140 144 150 170 200 240
1152 x 864 32 60 70 72 75 85 100 120 140 144 150 170 200
1280 x 720 32 60
1280 x 768 32 60 70 72 75 85 100 120 140 144 150 170
1280 x 800 32 60 70 72 75 85 100 120 140 144 150 170
1280 x 960 32 60 70 72 75 85 100 120 140 144 150 170
1280 x 1024 32 60 70 72 75 85 100 120 140 144 150 170
1360 x 768 32 60 70 72 75 85 100 120 140 144 150 170
1600 x 900 32 60 70 72 75 85 100 120 140 144 150
1600 x 1024 32 60 70 72 75 85 100 120
1600 x 1200 32 60 70 72 75 85 100 120
1680 x 1050 32 60
1920 x 1080 32 60
1920 x 1200 32 60 70 72 75 85 100
1920 x 1440 32 60 70 72 75 85
2048 x 1536 32 60 "
there is no sign of 1440x900 resolution!