I'm also having an issue with not being able to scan documents to the computer. I just updated to Win 8.1 from Win 7. Worked fine in Win 7. I've checked the xerox site and there doesn't appear to be a separate twain driver as in the past for win products. Any ideas on how to either get correct driver or change settings to make scanner work to save to computer?
What worked for me is changing the login information on the CentreWare site.
Login Name: name I use to login to my computer; mine is my email address for my MSN/Hotmail acount
Password: password I use to login to my computer
Share Name: name of folder where my scanned documents are stored (I do not include the pathname)
I hope this helps.