Windows 7 black screen

I have just recently upgraded to 10.8.4

I have an imac 11,2

I was trying to install windows 7

bootcamp runs

does the partition

I get to windows 7 run to the 5 step and it says

completing installation ...

then it reboots does the same thing

and the screen just goes black.

I don't understand what happened.

I tried this

http://support.apple.com/kb/TS3173

but with no help

So I have a windows 7 disc

a usb stick with Windows support folder in in formated as ms-dos fat and

a second usb stick with http://support.apple.com/kb/TS3173

which is a Master boot record.

Hardware Overview:

Model Name: iMac

Model Identifier: iMac11,2

Processor Name: Intel Core i3

Processor Speed: 3.06 GHz

Number of Processors: 1

Total Number of Cores: 2

L2 Cache (per Core): 256 KB

L3 Cache: 4 MB

Memory: 4 GB

Processor Interconnect Speed: 5.86 GT/s

Boot ROM Version: IM112.0057.B01

SMC Version (system): 1.64f5