Had a trojan attack and removed "rch.sys" (gen-nullo)with malwarebytes,super anti-spyware (free) and avg. It installed xobni and weather channel desktop pops up. I never installed these applications on my machine. Attack occurred after attemping to read email from a mac user (?) Attempted to remove xobni and weather channel with the remove/add software window. Xobni is gone but weather channel desktop pops up everytime reboot PC. Ichecked starup window but its empty. any suggestion on how proceed