New to LimeWire with a problem

I'm new to Limewire- I just downloaded limewire and installed it two days ago on a Windows ME Machine with a cable connection from home. I have a firewall installed on my computer from McAfee and don't know if this is causing my problem. All my other applications run fine.

My first problem is that even though I could download anything the first day, now I select a file to download, it connects and then just sits at zero (speed).

Second problem: When I go to kill that download, the whole program stoves up. This also happens when I try to just select something else to download.

More info:
I have opted to only show the files with 4-star quality and cable or higher connection. If there's anything else I need to tell you, please let me know.

TIA,
Michelle