Blender CTD on startup

Whenever I open Blender I get a CTD. I have uninstalled and reinstalled it for the past few weeks, but my professor is starting to get angry with me not being able to do work on my laptop.

I’m running Windows 7 Home Premium 64 Bit
Intel i7 Q720
ATI Mobility Radeon HD 5870

can provide any other information needed.

Ctd???

Crash to desktop, get the zip version of blender for your windows, unzip and start blender from comand shell.
May you get some error messages.

Cheers mib