On my Mom's computer I've seen this, I simply wait 5-10 seconds and Blender appears... 
I've waited a few hours before.

Reinstall
Done, many times, and with different versions of Blender.
Did you update or change your python or graphics drivers recently?
Nope, I did nothing different at all

I've tried re-installing it, and even different versions of Blender.
Hmm...maybe this link(scroll down) will be helpful to you?
I haven't installed python, though I didn't think you needed it to use blender, do you?