Trojan SPM/LX

This is my first experience in dealing with a user who appears to have a Trojan on his computer and I do not have any expertise in virus/Trojan removal.  The user has received a Windows Internet Explorer alert message which reads; "There is a security vulnerablilty from the Trojan SPM/LX. We recommend you DOWNLOAD one of the security software programs to prevent malware infections."  The infected computer is runing Symantec Antivirus the virus definition file is up to date.

I've Google'd SPM/LX and from the results I selected forum.worldstart.com which addressed a hijacked/infected browser, and forums.techguy.org/security/484536-solved-trojan-spm-lx-help.html which addressed SPM/LX more specifically.  In the information I found at Techguy there is reference to SmitfraudFix.  I've tried to do more research on SmitfraudFix and did see a warning at bleepingcomputer.com which advises;  "I do not recommend using the tool without guidance from a qualified malware removal specialist!"

I then randomly selected www.ewido.net/en/onlinescan/ and www.windowsecurity.com/trojanscan/ to run scans on the user's computer and neither one detected any virus or Trojan.

I'm unable to find any information about the SPM/LX Trojan searching at McAfee, Symantec, etc. and I'm hoping that one of you might be able to validate whether SmitfraudFix would be a good tool to use or if you would suggest that I secure the services of a qualified malware removal specialist or yet, take some other course of action.