tried both of those options.....
and ??
OK! the long version!
What kind of files are we talking about??
Do the files play in other players? You say WMP plays the videos fine, you have tried all of them? Are they different file types?
Have you just tried just resetting the preferences or have you erased the preferences directory? Preferred over re stetting, specially if re stetting doesn't help when an older version worked.
What has changed since the time an older version worked and now doesn't? Possible updates to system and you haven't used the player in a while!
What does VLC's Media information say about the files?
What does VLC's Messages say about the files?
I have no crystal ball here, you are going to have to give me something to go on.
Please note: VLC 0.8.3 was never an official release.