Since you are using Symantec, go to www.symantec.com for support.
You might also try this web site - http://www.bleepingcomputer.com - contains details for many of the common infections, often immediately after they began to appear in the wild, and instructions are provided for how to remove the infections using their malware removal guides. They also have forums where you can seek help from people who specialize in malware removal.
These are other free programs that may help:
Superantispyware Free - http://www.superantispyware.com/downloadfile.html?productid=superantispywarefree
TDSSKiller (free) - http://support.kaspersky.com/faq/?qid=208283363
HitmanPro (free for 30 days) - http://www.surfright.nl/en/hitmanpro