Windows 7: Neverwinter Nights 2 Gold screen issue

Hi everyone, need some help with my not original version el NWN 2 Gold Edition...
Downloaded it as 2 ISO files, mounted them with Daemon then installed them (everywhing ok by now).
I can create a new character, play normaly but at some maps i can only sometimes see my character and nothing else...the screen turns all light blue-ish. Can't play like that...
I wasn't able to find a fix to this...made the latest update of NWN 2.



So please, if someone knows what the hell is going on...i'd really appreciate it.
i suppose my specs are down below

Firstly, did you get your copy from Bioware? or somewhere else?