Toshiba Satellite - Screen resolution problem with Window 7

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Guest
I am using Toshiba Satellite A215-S4807 AMD Windows Vista Home premium laptop.Yesterday I have installed Window 7 Ultimate everything works find except the screen resolution as it has only two options either 800*600 or 1024*768.

Previously my vista have a very good look and feel but due to only two o available options for screen resolution I am not able to change my screen resolution anymore.

I have a Standard VGA graphic card.

Can anyone please help me to fix my screen resolution problem?