Hi paul101,
If you located where the virus was flagged (see avast log), you can scan the file(s) in question against the scanners of virustotal.com.
In the past this detection was also reported as a false positive, so we have to check this.
If it is the real malware, a dangerous trojan, then look for these traces to be present on your computer:
Kill the following processes
mul_.exe, msgked.exe, services.exe, msgked.exe, msgked.exe
Unregister the following DLLs and reboot
2.01.00.dll.
ljo.dll, mjice.dll, plenb.dll in Windows\system32\
objna.dll in Windows\system\
Delete these registry entries
HKEY_CURRENT_USER\software\microsoft\windows\currentversion\run\msmc
HKEY_LOCAL_MACHINE\software\microsoft\windows\currentversion\run\services process
Remove the following files
2.01.00.dll, mul_.exe.
ljo.dll, mjice.dll, msgked.exe, plenb.dll in Windows\system32\
services.exe in Windows\system32\config\
msgked.exe, objna.dll in Windows\system\
msgked.exe in Windows\temp\
polonus