Having difficulties installing Epson twain driver for scanner.

I have been trying to install the Epson AL-CX11N scanner to no avail. WinXP is rejecting my install saying "Could not copy files. Check the setup disc, then run setup again. c:\ . . . . . \system.ini". Once I click OK, it then gives me the error, "AN ERROR OCCURRED DURING SETUP. RESTART YOUR COMPUTER, THEN RUN SETUP AGAIN."

My scanner is networked, but I am 99% certain that fact has nothing to do with why the scanner installer has an error every time I attempt to run it.

Pertinent facts: I have already had this printer/scanner/fax installed on this system, and it functioned perfectly (scanner included) for approx 8 months. I had a problem printing, and hastily uninstalled the Epson software. Upon reinstall, the software sees my printer on the network (with an associated IP address handed out by my router), and successfully installs the printer portion. However, the Scanner part comes up with an error. I am using the installation CD, but I have also downloaded just the scanner setup files from Epson. I get the same error whether installing from CD or from the files on my desktop. My initial thought is that somehow my old TWAIN driver is still in the OS or in the Registry, and the new install can't continue because it can't overwrite the old one. There are no scanners shown in the scanners/imaging devices, and a search for .TWAIN (with hidden and system files included) yields no results.

What am I doing wrong? Anyone know of a quick program I can run to quickly remove all traces of previous twain devices from the OS? Should I attempt to clean the registry?

A search on GOOGLE found a guy with a similar problem, but no true solution: http://help.lockergnome.com/windows/Epson-4490-scanner-ftopict584015.html

Thanks for any help you can give me.