They are using an older less secure method, you need to dumb down windows 7.
The "tech" you spoke with is CLUELESS. The Buffalo FAQ answers this same question.
click the start button and type secpol.msc in the search function.
Browse to "Local Policies" -> "Security Options". Now look for the
entry "Network Security: LAN Manager authentication level" and open it.
Click on the dropdown menu and select "Send LM & NTLM - use NTLMv2
session security if negotiated".
Apply the settings.
In the Advanced sharing settings page of Network and sharing center, you need to have it set as Work/Home profile. Try
Make sure computers are the same workgroup for now (you can change it later)
Enable network discovery
Turn on file and print sharing
Turn off password protected sharing
Turn on Use user accounts and passwords to connect to other computers
