limewire uses half of my cpu
 

after a few downloads my task manager shows that
limewire (basic 4.12.6) is eating up to 50-80% of my cpu,
where it used to be just a 1%.
is it because i've downloaded something infected with a virus?
is there a way i can restore limewire to its normal status?
i'll be very grateful to anyone who can hlep me out on this.
Thanks.