If you'd like some free options, consider this web site - http://www.bleepingcomputer.com - which 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.
Before bringing the computer to a service group for removal of the trojan and beofre getting a response from Microsoft I decided to update Spybot and Trend Micro's scan program. Both found some files which I deleted and this evidently removed the trojan.
There were a number of other suggestions which I tried, all involved downloading software, creating boot disks etc. Unfortunately all of them either did not work or had missing files after extrcting the zip files.
So, Spybot and or Trend Micro's program worked for me.
Thanks for all your help. Still not sure why my McAfee didn't spot it and when I ran the MS Security Essential scan that did not pick it up either.
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