iwolf has pointed out the solution I had to adopt...
The virus encrypted all the music files on the infected machine, including the default sample music. All I had to do to get an original copy of an unencrypted file was to grab a copy of one of the sample music files from another PC.
I tell you, I've never listened to it before but "Sleep Away" by Bob Acri has never sounded so good! - On a Windows 7 machine, it can be found in C:\Users\Public\Music\Sample Music\Sleep Away.mp3
Perhaps a more ideal file (smaller filesize) would be one of the sample pictures in C:\Users\Public\Pictures\Sample Pictures. The Koala.jpg looks a pretty cute and suitable hero.
Apologies if I am teaching anyone to suck eggs (sorry ryko), but it may be worth explaining that although you can easily replace the corrupted (encrypted) files if you have original back up copies, the issue is you may not remove the infection if you do not use the appropriate scanning/fixing tool and you may not have backup copies of all files that have been encrypted.
The most important function is to stop and remove the infection and then recover any lost files. You will need antivirus/anti-malware tools to do this, and Dr Web or Kaspersky both provide a specific tool for this particular job. However as many sufferers do not have back up copies of files required to reverse the encryption this trojan performs, it hampers chances of recovering the files. Fortunately however as the trojan encrypts the sample music and pictures that come installed on Windows, it is much easier to get an unencrypted original of one of those files and hence restore your own files.
Good luck to anyone unfortunate enough to have been infected and troubled by this problem.
