Did the two PCs connect to your previous ISP without any issue?
Did the tech who installed the service not make sure that you could get online and browse before he/she left?
You shouldn't need any username or password with a direct LAN connection. I'm not familiar with a setup CD. Perhaps it was something from the legacy days of Hughesnet. The computer normally goes through a short setup process when one introduces a new method of connection or ISP, but it's basically asking if you want it to be a private or public connection. It should do this when you connect the LAN cable to the PC from the fully booted HT2000W modem, or even when you turn the computer on after connecting the cable from the fully booted HT2000W. The WiFi requires passwords, both for connection and for accessing its GUI. The GUI password is admin, and the connection's password is the SSID listed on the back of the modem (2.4Ghz and 5Ghz radios). But, again, these are only for the WiFi. A direct connection shouldn't need a password.
Are your network adapters set to obtain the IP address automatically (they normally are unless someone manually changes them to a specific IP address)?
If you open your browser, then type 192.168.0.1 into the address bar and hit enter, does it take you to the System Control Center? If so, you are at least connecting to the modem. If not, something isn't allowing the connection at all. If you can get to the System Control Center, are both boxes at the top of the page green?
Have you tried running the Windows built in network troubleshooter?
Hopefully, someone with more ideas will pop in.