pFF failing name lookups?

I have been trying to use pFF on a system at work, but have run in to a problem that has me stumped. I have FF installed previously, but had to remove it because applications may not be installed on work computers. I got my boss to OK my using FF, provided I could do it without installing it. Naturally, I already knew about pFF when I approached him about this, so I just popped my USB key into the system and started up pFF. When it loads, I can not connect to any sites, because name lookups always fail. I'm not at the system now to give the exact error, but I will post that when I get to work tonight. I do remember it being something along the lines of "bleh.meh.domain.xxx could not be found" for any site I try to access. The application works fine at home, and as noted above, FF when installed worked fine. Just pFF is having a problem. It doesn't matter if I run from a local directory or my USB key.

I haven't tried doing an nslookup from a command prompt and surfing via web address to see if that works, so I suppose that's the next step. Other than that, can anyone give any recommendations on how to get this working?

Thanks.

RagManX