I have a Dell s2009wb monitor in which the native or recommended (optimal) resolution is 1600x900. I use win7.my video is ati radeon xpress 200. was nearly impossible to find a driver as many websites said that it is not win7 compliant. I found and used this.
still no 1600x900, only 1600x1200
I then downloaded this as my monitor says generic non-pnp monitor
nope.avi still no 1600x900, only 1600x1200 with 1280x1024 the option below it