Sunbelt - makers of CounterSpy - some time back brought out a new integrated antivirus and antispyware application called vipre, it's light on resources and hardly affects the performance of yor PC while offering decent protection worth a look if you are on a slowish machine. BUT they also produce a free repair system called VIPRERescue which initially was a bit poop, did a full scan missed loads of stuff and didn't clean much. Now however it has got far better as it does a targeted scan and removes stuff efficiently so is well worth keeping on an emergency disk or in yor disk set if you are a technician, repair dude check it here