Dell Latitude D620 NVIDIA for Windows XP 64bit

Many laptops are available with 64bit hardware but windows xp or other versions are not equipped with all required drivers.

I can’t say exactly about all the drivers but if you are facing problem regarding nvidia graphics so you can use this driver scanner in IE to detect suitable version of driver for you hardware.

e.g.
http://www.nvidia.com/object/geforce_notebook_winxp64_179.48_beta.html

or

2nd step from here…

http://www.nvidia.com/Download/index.aspx?lang=en-us