I am unable to play any DVD film on this computer with either Realplayer or Window Media player Have Updated Both programs To the Latest version and Still getting Nothing just and Unable to play message No error code

Is there a free standalone DVD player you can recommend?
Is it worthwhile using one of those 3rd party Multi codec programs to run Film Dvds on the Players?
such as BSplayer 1.37.826,Codec Pack All-In-1 6.0.3.0

My old computer had no problem playing these Same Players and Windows XP Professional (on Both)