PcAnywhere Host Error (Another Host is Running)

Hi there, TechyV!
I have had to recently reformat my computer several times because of a particular troublesome virus/worm problem.
When I tried reinstalling pcAnywhere for the third time, if I remember it correctly, this error message popped up.
All previous files have been erased in my last reformat so I don't understand how "another pcAnywhere host" can run.
Please help in this error, any suggestions will greatly help.
Thanks!

pcAnywhere Host
Unable to launch the selected pcanywhere host
because another pcanywhere host is running.
OK
