Whoa...you get pretty good support here, it's free & you don't have to wait for an email reply.
To be fair, it's not LimeWire's fault that you got infected...if you're not scanning downloaded files before you open them, whose fault is that?? No Gnutella client can control what's shared across the network, it's up to the user to be responsible for their computer's security.

Did you try the fix in point 5 of the link that LOTR gave? That has worked for quite a few people.