Are you using a spyware program such as pestpatrol or similar?

Can you give us a total description of your set up:
1. What firewalls you have?
2. What version of Limewire (LW) & Java do you have? (Go to LW's menu Help>About LW...) Will show both LW & Java version.
3. How much ram?
4. Hard Disk space available?
5. Connection type? (eg: dialup, broadband, cable, etc.)
6. Where are you trying to connect from (home, school, work, etc.)?
7. Are you sharing the connection with other computers or p2p sharing programs? If yes, please give details of set up.

Try deleting your LW Preferences folder whilst LW is closed; instructions here: Point #2 & 3 in Fixes for Limewire (sample image included at bottom of page.) But make a note of any important settings because once you do this you'll need to reset your options such as download location, etc.