You should only have a static ip address if you requested one and pay extra for it each month.
To find the settings to try manually, connect your modem to your PC and restart it.
Go to Start > Run, type cmd and press Enter.
In the command box, type ipconfig /all (note the space) and press enter.
You will get a list of DNS servers, ip address etc from there.
If that still doesn't work, you may need to call Virgin support line, though you may get nowhere as they claim not support wireless if it's not their product.
-------------------- OK OK I can't go any faster! aaaaaaaaaaaagh!