i had once that my virusscanner quarantained some files when unpacking the zip with the drivers...
maybe you try download it again and turn off the antivirus when you install ?
Trying to install just the driver for the 3600 on a Win2003 server for Terminal Services. Install tells me that a number of files are missing and that I should insert the CD (which I don't have) The missing files are numerous but some have the fomrat ITDRVCA.CHM; itdrvbp.chm; itdrvcz.chm and so on.
Any ideas?
Mike