VLC is a stand alone media player that uses its own libraries to decode media files. It does not use Direct Show nor does it install any DDLs or other helper files on your system. The additions to your registry are purely to support the file extensions so that you can double or right click within a menu and have the file call the player. So there is nothing special about the install.
Because of this it is highly unlikely that VLC is causing problems for other programs installed on your system.
If you went to the manufactures web site and downloaded the latest drivers according to the model of your video card the drivers should work, assuming that the drivers carry a date later than 10/04 IE the card is not real old.
If the card is old and current drivers can NOT be obtained then VLC 0.8.2 maybe the best you can do.
http://downloads.videolan.org/pub/video ... 8.2/win32/
File name: vlc_0.8.2-win32.exe