Windows wont Boot unexpectedly!

My computer has been running perfectly fine for some time now and just today
when I got home and tried to turn it on my computer seemed to stop booting
up. I bought this computer from dell a few years ago and it is now off
warranty and they wont help me unless I pay them which is something I can't
afford at the moment. This problem was very VERY unexpected.

Heres what happens:
I turn on my PC and the DELL logo screen with the loading bar at the bottom
shows up and looks like its loaded about 20-25% and then freezes and doesn't
move from then on.

I've waited around 30 minutes to see if anything would happen and NOTHING at
all changes.
I am completely unable to do anything to boot up my computer in safe mode or
from the last known good configuration.

Last changes to my computer and the possible problem causer:
Yesterday while starting my computer for the first time that day I got a
message saying "Windows has recovered from a serious error" which I normally
don't get this message. I looked into it and said this was possibly caused by
my videocard drivers not being up to date and was instructed to do a windows
update and install the new driver. I did this and installed the drivers on
windows update for my video card "NVIDIA GeForce 7950 GX2" and during this
installation I got an error message saying there was a problem and the
installation had to end and I pushed "end now" and the dialog box went away
BUT the installation process for this new driver was still running and then
completed and prompted me to restart my computer. I did this and it seemed to
have worked fine.

Now today after my computer was shut down for the night. My computer does
what I mentioned above.

I need any help or ideas anyone can give.
Thanks.