TSGL: Avast Virus Scanner and Avira Antivirus

[Mike Ferrell]

I have installed a couple free programs that I have never used before, but both come highly rated, so I have been trying them out.  These are Avira Antivirus Personal Scanner and Alwil's Avast Virus Scanner.  The Avira scanner keeps identifying Alwil Software (Avast) as the Trojan Horse TR/Gorshok.A
AVG Free does not identify it as a trojan.

I believe the Avira scanner is legitimate and downloaded from a legitimate site, but not sure why it keeps identifying Avast as containing a trojan, unless these two av's just won't play well together, and the result from Avira could just be a false positive.

This alert pops up a couple times each day.  I have Googled to read about this trojan, but everything is in a foreign language.  

I tried the Secunia Inspector online scan, but it's primarily looking for insecure software versions and missing updates instead of looking for Trojans.

What is a good safe website to help identify the trojan TR/Gorshok.A, and perhaps do an online scan to see if somehow it was installed with my download?  I tried the WindowsSecurity site, but it can't yet handle Vista.  I would like to specifically scan for Trojans, not just another typical virus scan.  And I'm not particularly fond of downloading yet another free virus scanner for a trial.  So, again, is there any reliable safe site for either identifying this virus and/or doing an online scan to see if I have it?

Mike