Graphics card problem

hello sir ,

I have a nvidia graphics card GE force 6200 (in pci slot).recently i am having a strange problem. as soon as i switch on mycomputer , the display flickers and when i go to my computer the drivesappear as if it is smudged and display is very dull. First i thought itmay be because of my monitor .but when i removed my graphics card , thedisplay becomes normal. and also when i was using my graphics card andwhenever i put my system into standby mode , it would automaticallycome out of standby mode without moving the mouse. Is it somethingrelated to drivers.Do i need to install the latest NVIDIA drivers.

The refresh rate is 60 hz and no other option is available . There is acheck box(hide modes this computer cannot display) below that. If iselect that , then i can select 70 hz and so on upto 100hz. but when iselect anything greater than 70 hz . i get a blank screen and a hzsymbol is shown on the screen. Even if i select 70 hz , the screen isagain blurred and dull and flickers.How do i solve this problem ??

My configuration is as follows:
Intel P4 2.66 ghz
Intel D101GGC motherboard
512 Mb ram
Samsung syncmaster 591s Monitor.