Hi Ursula,
Thank you,
I ran AVST antivirus ver. 4.5. I use this anti virus about one year without any problem.
I look on the Task Manager while running Limewire (it is take some time for the Task manger to respond). The processes you mentind (it is more than one) take some time about 1% cpu time but most of the time they take 0%. The System idle process take most of CPU time around 95%. The Limewire.exe process take sometime about 2% but most of the time 0%. All other processes (about 40 process) take 0%.
Regarding other programes it is not importent, Any program run very slow also LW itself without any other program run in parallel.
Actualy I use Internet explorrer and Outlook Express in parallel.
I hop this information help you to resolve the problem.

Thank again,
Naftali