NetAuthAgent & nmbd suddenly active after using University wifi?

Hello -
I'm trying to ascertain if I am at risk...
About 1 week ago I connected to the University of Minnesota's "guest" wifi network. I was asked to provide an email address and that's all. I was online.
But I use Little Snitch so granted access to a flurry of temporary connections to when they popped up as I was in a rush to connect. Possibly a bad move, but I was guided through this process by a U of MN tech guy so I felt ok about it. It worked for the weekend and that was that. I didn't use my email or login to any websites, I just pulled up a YouTube video for a group's presentation.
All seemed well... But, when I got home, I received 2 Little Snitch notifications: NetAuthAgent and nmbd. I don't know if any of this is normal but NetAuthAgent showed up as ~myusername but nmbd showed up as root.
Also, my hard drive space also went down to zero on a random instance when Safari froze up, but I don't have a screen grab of that.
Also, in my Finder, there was a "PC Server" device listed under Shared. This was new. This freaked me out.
Not only have I been unable to stop NetAuthAgent and nmbd from prompting me for access every single time I start my computer, the times I have experimented/troubleshot the issue and give them permission, I'm getting the PC Server listed under Shared.
I've run MacScan and I can block it out by denying it access via Little Snitch, but I wanted to ask the digital Jedi out there if this was normal, because when I try to click "Connect To", it give me the following error...
I've seen NetAuthAgent & nmbd before, but not like this.
In summary, these instances started happening constantly after I used the University's network and has not gone away.
Thanks in advance for your time,
- AmpLife
P.S. I'm running the latest software on a MBP, 17" (Mid '09)

twtwtw, dude, youre good... THANK YOU... i think we got it.
actually i didn't have to delete any proxy settings, i left those alone and deleted the wifi network i used at the university:
Sys Prefs > Network > Advanced > Airport > Preferred Networks
once i located the name of the potentially problematic wifi network (U of M Guest) that you said i might be connecting to under preferred networks, i clicked the " - " (minus symbol) to remove it. after that I clicked "OK" and it went back to Network (sys pref) where i clicked "Apply".
finally, I quit everything and restarted my mac. when it came back on, the requests for nmbd were gone and nothing i do can recreate the NetAuthAgent alert.
i'm also not seeing anything under shared that shouldn't be there!
sweeet...
i'm going to sleep on it and give it 48 hours... i'm sure it'll be fine, but when i verify it's gone, i'll come back and hit you with some Correct Answer points. i wouldn't have thought to delete the preferred networks without you guiding me to the Sharing AND Network pref panes.
peace!
PS: here is screen grab of the PASV thing (and the proxy settings i mentioned above) for your reference

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