My laptop (Dell Studio Notebook 1747) came drivers preinstalled for Win 7 (64-bit) drivers. now I want to update drivers using ATI installer. but I cannot find any driver for this card in ATI site.
Aren't the drivers included in the Catalyst suite?
That is meant for the 5xxx series, if that is not what you're looking for then, according to AMD/ATI, the drivers supplied by the notebook manufacturer are the ones that must be used as they are specific to the display type.
From ATI's website:
The Drivers link on the above linked page does not list any Win7-64bit drivers for the HD 500 series card, however, if it is based on the HD 4000 series tech then you may be able to use the HD 4000 series drivers for Win7-64bit
You could also check the website for the laptop manufacturer.