This is the main issue with alot of old games the out of date video (and audio) codecs.

one solution is posted here-
http://www.gog.com/en/forum/swat_/swat_3_dderr_generic_error_solution

another one which might also fix the swat 2 movies problem is to install the indeo codec (the old version) u can download it here-
http://www.free-codecs.com/download/Indeo_Codec.htm

it might not register with windows so U need to manually register it
1.open a command window -
press start button and write in the search box "cmd" a cmd.exe will show, right click it and open as administrator.
2. write regsvr32 ir50_32.dll it will register the codec with windows
3. play :)

got it here-
http://www.leanerminds.com/swat3/swat3_vistafix.html

same problem with sin (old shooter) its not showing the movies and getting stuck.
the fix for this is to make a shortcut of sin.exe and add +menu_main as in
"folder\sin.exe" +menu_main.
With latest nvidia drivers most old open gl don't launch it can also be fixed.

Its a 2 for 1 post :)

------------------------
List of stuff I'm Currently fixing

Wages of Sin- Challenging
SW JK2 Mysteries of the sith (stream audio tracks from hdd instead of cd) - extremely hard
X wing alliance- extremely hard
History Channel Civil war- Just bad..

Fixed-
C&C Generals+Zero Hour- Challenging
Road to El Dorado- Easy
Spycraft- Moderate
Messiah gog version- Challenging
Swat 3- Challenging
Red Alert 2 on widescreen- Moderate
Nfs 4- Challenging
Quake- Easy
Sin- challenging
Die by the sword with 3d- Challenging
Soldier OF Fourtne- Challenging
Clandestiny- Easy :)

all running on latest drivers.

U can PM me for fix related to this list.

Just wanted to say thanks, this fixes the missing audio in the SWAT 2 movies.