Crashing from servers...

[MedicalAssistance]

Hey, I'm not entirely a smart person with tekkit (I know how to do stuff IN it, but not how to fix it), and I have no clue what to do. I'm hoping someone can help. My delema:

I am joining a friend's server to do a bit of tekkit, but as soon as I join and it loads (right after the dirt screen would dissappear and the server would load) and my screen goes black or white and it gives me a crash screen (for about 1 second and then goes back to black or white). I thought it just might be his server, so I tried another server. The same problem occurred; joined, screen went white/black, crash screen, back to white/black.

I've deleted the launcher and re-downloaded it several time to no avail. If anyone has an suggestions? ...Please?