Bootcamp, ATI 4850 driver not installs on windows 7 x64.

Hi all, I need some help with ATI driver installation.
I followed Windows x64 installation instructions available
on Apple page.
Here is how I installed Windows 7 x64:
1. Partitioning - went fine.
2. Windows 7 x64 Installation - black screen issue encountered.
3. I prepared usb drive as described on apple page - didn't work
Black screen again - I rebooted several times with no success.
4. I removed atikmdag.sys- according to description found on the internet.
5. Then I was able to complete installation.
6. Installed Bootcamp 3.0 from MaxOS CD
7. I was asked for reboot - I confirmed.
8. Black screen again!
9. I repeated point 4 (atikmdag.sys removal) and then
was able to login to Win7
10. I installed Bootcamp 3.1 for windows 64 update.
11. I was asked for reboot - I confirmed.
12. Black screen AGAIN!
13. I repeated point 4 AGAIN (atikmdag.sys removal) and then
was able to login to Win7
14. I tried to repeat unistall/install of Bootcamp 3.0/3.1
several times with the same result:
A). Install Bootcamp
B). Bootcamp asks for reboot
C). Black screen issue
D). manual atikmdag.sys removal
E). go to A.
I also tried ATI Catalyst drivers installation but there is still Black screen issue and driver is not really installed.
Also I executed Windows Update and tried to install ATI driver
from there, but its installation fails!
I have iMac i7 8GB RAM - just got it two days ago and can't it really use with Win7
I'll appreciate any help.

Plug in another monitor this will fix the problem. windows/apple (one of the two) turns the mini port in the back into the main output. once you plug in a new monitor the install will continue and the drivers are updated of the apple disc will will be able to unplug the monitor and everything should be ok.

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