Question about a trojan

KAV found a trojan on my PC and removed it, I picked it up while downloading a file, that's the last time I'm downloading files from not really trusted sources .

I forgot about the trojan name, but searched for it on Google and it seems it used an iframe exploit in IE or something, not really serious I think.

But anyway, maybe I'm a bit paranoid but sometimes I do see multiple instances of ie.exe while I only opened one and in Port Explorer I sometimes see hidden sockets (from ie.exe). Can a browser have hidden sockets to begin with?

ZA Pro does seem to pass all the leaktests, so I wonder if I'm paranoid or not especially because the trojan wasn't that highly advanced, but my second question is, can already deleted trojans still function (dll injection or something)? Maybe a stupid question but just checking.

 

I have scanned my system with TDS, and no trojans were found. I feel a lot better now. The hidden browser sockets seem to be a browser related problem.