Got to the config file (Documents/Witcher2/Config/User.ini) and set Ubersampling to 1.
Setting it to 2 actually enables the Ubersampling effect while 1 is Anisotropic.
Guys, can I enable anisotropic filter in The Witcher 2?
No it's not a problem. Just remember to set it to atleast 500mb less than your total GPU VRAM.