Pc security threat?

I have DSL and I think I may have a security issue, I use a P2P program called Limewire sometimes to download music but hardly ever and I only have the program on and running when I use it. The problem is I usually keep my PC and dsl connection on most of the time and there have been occasions that when I get on my pc that programs are opened and running but I didn't think much about till yesterday when I got on my computer Limewire was opened up and files where being downloaded the only explaination is that someone has been getting on my pc from a remote location and opening up programs on my PC

I have uninstalled Limewire, set up a firewall, and refressed my ip address what other steps should I take?

Also can you explain how another person is able to use (hack) my pc from a remote location ?

Pc security threat?noton

there can be a possibility that someone had used your connection if you are using a wireless connection at home. and if your limewire is active all the time, a great possibility also that anyone else could had downloaded some of your files like music, movies, documents, etc. as limewire is a free shareware software. but you can check your pc if someone had ever try making some connections to yours. but the best to do is to put off your pc if your not using it. disconnect any connections that is alive. try to be careful always.