Hey guys, I don't know how to solve this in Windows... I have a few 5850s/30s. They wouldn't work on a fresh Windows XP (sp2) install, even when I downloaded all the catalyst whatnots. I couldn't even get ubuntu to boot on this particular motherboard either. So I used Linuxcoin, the linux made for bitcoin mining and booting off a USB stick. I use that on the computer and it's actually very very easy to start mining. And since my computer crashes or the power goes out often, I set it up a lot. (You can do a persistent usb stick but I couldn't get it to work.)
I have a 5830 running very smoothly in Windows 7 now. Just had to download the catalyst drivers. So I would recommend getting LinuxCoin if these are dedicated miners. If not, try linux, though I really dislike the new ubuntu.
And on page 5, there's the command lines you need. Ask if you need help.https://en.bitcoin.it/wiki/LinuxCoin