There is a feeling going around these forums that we are slowly but surely bashing our heads to bits against brick walls. We have no idea how many downloads you are sttempting, how long you have been using limewire, if it has worked in the past or your shoe size, type of computer, or anything else.
look at
http://www.gnutellaforums.com/showpo...91&postcount=2
This is a good place to start, once you have had a look at the Stickies (useful posts which cover most questions) in the forums, but I would ask to start with, if you have anti virus and anti spyware software installed and use and update it regularly. Guessing very wildly I'd say there is a possibility you have a virus. A sticky about viruses can be found at the head of many forums.