I would download the SERT tool (Symantec Endpoint Recovery Tool), and update it with the latest defs. The tool can be downloaded via fileconnect. It is a boot CD, so you'll need to burn the ISO.
Here are the instructions on how to update the defs:
http://www.symantec.com/business/support/index?page=content&id=TECH131732&locale=en_US
Any time, that you can get an enviroment where windows files and services are not use it's the way to go. Makes it a lot easier to remove threats.