Hello lonelyone,
Linked previously,
http://forums.spybot.info/showthread.php?t=52093
Also see:
http://forums.spybot.info/showthread.php?t=36272
As in, did you install another anti virus program. Incomplete answers are not going to help us to help you.
If there is a possibility the computer is infected, follow the instructions in this link to produce aHJT(Now a DDS) log: "BEFORE you POST"(READ this Procedure BEFORE Requesting Assistance)
Then start your own thread in the Malware Removal Forum where an analyst will advise you as soon as available.
Best regards.