im having internal error problems

[Jrwilson44]

I keep getting a internal error pop-up which usually comes in pairs.(two of the same message) after this happens a few times the pop-up window freezes and i cant access lime wire. then when i manually shut it down i loose all the files im downloading. Ive tried shutting it down through task manager and restarting the system. Everytime when i reload lime wire it erases the files im downloading and puts old songs on the list that i already downloaded like a month ago.