Problem With explorer not starting up and videos not playing but audio is.

Everytime I start my computer and log on my account I am faced with a

black screen except for the white mouse pointer in the screen. I can

load explorer.exe back using task manager however its quite

inconvenient. For any fix on this please let me know. I looked at my

registry and explorer.exe is in the shell.

Another problem I have is that any video on any video player will not

work. I can hear the sound perfectly but no video. Examples of the

players I used is DivX, Windows Media Player, Quicktime, and VLC. I'm

trying to play a .AVI file but as previously stated I cannot see the

video. If anyone has a solution to this please let me know.

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Jjhperlas