Plain Bill

I've just started setting up an XP CD for a new drive I'll be installing. I think I've got most of it figured out, until I try it that is. But the ATI install has me baffled. I've seen the example here http://www.msfn.org/board/index.php?showtopic=33909 and Simon's example. But I can't seem to extract the required files, WRar tells me it's not a valid archive? If I run setup and cancel after the install I don't see the Control Panel files. I'd prefer to use the iss method, but I don't have an XP (W2K now) system to create the ISS file. This method sorta defeats the purpose I want a UA CD for anyway. Help appreciated.