Hi,
It seems that machine is infected. Isolate the machine from the network.
Use Power Eraser to detect threat and remove them
http://www.symantec.com/theme.jsp?themeid=spe-user-guide
Also can use SERT to boot on a CD and clean your machine
http://www.symantec.com/docs/TECH131732
Best practices for responding to active threats on a network
http://www.symantec.com/docs/TECH122466