Notebook won't reboot after nvidia driver install

[MR ZenWiz]

I think I goofed up....

My displayport doesn't work riht, and Nvidia has a newer driver than
the one in the Xubuntu repository (340.104, vs 340.102).

I downloaded the driver from nvidia's web site and installed it.

Now the notebook won't boot at all - I'm running off a flash drive.

It keeps stopping in busybox.  I've tried going back to recover mode
and previous versions that used to work fine, and it's just plain
dead.  I really don't want to have to do a fuil reinstlla, but I can
if that's my only option.

I can try to capture the busybox output if necessary, but a) I need
this thing back up asap, and b) I have never had particularly good
luck working with busybox at all, on this and previous notebooks.

Thanks.
MR