OK, guys. Thanks for the help. I had to re-install it and than remove it from both of our user-accounts, so it seems fine now.
However, my Norton Systemworks went for a system scan today, and guess what it found? Check this link. Maybe harmless, but still...
http://securityresponse.symantec.com/avcenter/ven...ta/adware.lop.html
"Transmission
This adware component must be manually installed, or installed as a component of another program."
Yeah, right... No more Plus for me...