Can't Install ATI Video Drivers on Bootcamp with Windows 7 64-bit

I've just installed Windows 7 64-bit under Bootcamp but can't seem to get any ATI Graphics drivers to install. I ran into the common blank-screen problem during installation and temporarily solved that by deleting atikmdag.sys from within Lion. At the moment W7 runs with 640x800 resolution (pretty chunky on a 27" screen!). The ATI Catalyst software just doesn't run at all (i.e click on it and nothing happens). I've used DriverSweeper to force remove all drivers and start again but every time I reboot, Windows automatically reinstalls the default driver that seems to be causing the problem in the first place!
For reference, here are iMac specs:
iMac 27" w/ OS X Lion 10.7.2
2.8Ghz Intel Core i7
4GB 1067Mhz DDR3 RAM
ATI Radeon HD 4850 512MB GDDR3
Any ideas?
Thanks

gets asked 100s of times, daily too. check my profile bookmarks for "AMD" thread(s).

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