This is a known issue with Neverwinter Nights; it was supposed to be fixed with the last patch but that doesn't seem to be the case for many people. Hopefully the developers will fix it properly in the future.
In the meantime, I would suggest playing with your compatability settings as Grombart says above. If you're still having problems and want to watch them, you can download Bink from RAD Game Tools and watch them outside of the game, or possibly find them on YouTube. RAD Game Tools - Bink Video Further reading: http://nwn.bioware.com/forums/viewtopic.html?topic=581474&forum=49 http://nwn.bioware.com/forums/viewtopic.html?topic=620007&forum=49 http://nwn.bioware.com/forums/viewtopic.html?topic=598005&forum=49
appears to have found a solution
on the AMD forums for people using Radeon graphics cards and chipsets:
- Disable desktop composition on nwmain.exe
- Download a fixed binkw32.dll from the following site: http://www.mediafire.com/file/0mfgzd40nk0/binkw32_ati.zip
In your NWN installation directory, Rename
the existing binkw32.dll to binkw32_ati
.dll and extract the downloaded binkw32.dll into the folder
If shiny water does not work for you, disable it.
I have confirmed that this fix does work, having said that you should be cautious of updating DLLs because it is hard to know how the program utilizes the library and what things have changed betweens versions of said library