See
1.
LimeWire continually Popping up & also Opening at System Startup (click on link)
2.
WARNING: Viruses on network you should be aware of! (click on link)
3. I would highly recommend you going to get Norbie's advice. He will not only determine if you have a problem but give you easy instructions on how to resolve it. He is an expert!
NorbiesWorld (click on link) Follow his instructions carefully & post your results as requested & he will reply with the solution.