Problem playing video files in windows Vista

I can generally play video files in VLC but after a few hours VLC won’t play video files. It will open and show the first frame then only audio will play vlc will play the video file like an audio file without any picture but only audio.
Curiously I can play video in media player classic that comes with the community codec pack.
The problem goes away after I restart and then resurfaces after a few hours.
I have reinstalled my video drivers , vlc but problem still persists.
Dell 1525, Windows V. 2 gb ram.
Answer #1
Try preferences –>video–>output module there first check advanced options and then change the module to opengl , or maybe the codec is not supported by VLC .
Answer #2
Not codec. I can play the same file in the begining but after few hours from the time when comp was turned on , Vlc won’t be able ot play the video file. the same file I played earlier.
Answer #3
Just did what you asked and VLC crashed.
Answer #4
I have reinstalled my video drivers
you check for newer drivers ?
try uninstalling the driver then install/re-install drivers