Can't connect external monitor to Windows 7 bootcamp Macbook Pro 15 - ATI 6770

I recently puchased a Macbook pro 15 in 2012.  I have bootcamp set up and am running windows 7 home on the bootcamp partition.  When in windows I am unable to use an external monitor or overhead projector.  I have updated all of the ATI drivers and have fiddled with screen resolutions and display refresh rates to no avail.  I am using a cheapo mini displayport to VGA adapter which I have confirmed works while I am using the mac side of the machine. 
Unfortunately I have to use windows while at work and using a projector to display data is essential.
I am out of ideas at this point --  Help - - Please!!

I was hoping some of the multi/monitor people would show up and help you but I guess they missed it.
Have you gone into the Properties of the video drivers (via the Device Manager) and let it Update Driver either through the internet or migrate to the newer Boot Camp video drivers you recently downloaded?
The only other thing I can suggest is to completely delete the video drivers then reinstall them manually either through the Programs and Features control panel or in the Device Manager/ Video drivers and see if it "takes".
Don't forget you do have an Apple Software Updater in Windows also. It updates the Windows support software from Apple. (Boot Camp)
Sorry I can't help more........

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