Hi Darla, Welcome to the Gnutella Forums!!
Sounds like you may be infected. Try AVG 1st.
AVG(free) might be able to fix it. Be sure to update it before you scan your computer:
AVG Free Advisor: AVG Anti-Virus Free, then follow the prompts.
Try the fix in this thread:
To fix the limewire keeps popping up / no taskmanager bug do the following