OK, here's what I would like you to do, if you don't mind.
1a. On the affected PC, open a command processor window.
1b. Type IPCONFIG /ALL >ipconfig.txt. Copy ipconfig.txt to whichever machine you'll be using for Internet access (not via the Vodafone card, but through the DG834G).
1d. Open the ipconfig.txt file on the Internet machine with Notepad, and copy and paste the contents into your message.
2a. From your browser, connect to 192.168.0.1 (the DG834G). Login using the administrator ID and password.
2b. In the left column, select "Backup Settings".
2c. Select the "Backup" button. Save the resulting netgear.cfg file in an appropriate location on your PC.
2d. Open the netgear.cfg file with MS Word. Accept the default of "Windows encoding".
2e. Delete the whole "Basic Settings" section (item nos. beginning with 2) - we don't need to know these settings, and it would be better if others didn't know them either.
2f. Delete also any lines containing the word "Password".
2g. Copy & Paste the remainder of the configuration file into your message.
It may be possible to see some inconsistency between the two. Apologies in advance if it turns out to be a waste of your time.