Trojan.Riler is a very serious threat in my experience

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We had one computer stop accessing the network drives but their Internet still worked. I checked the network settings and nothing seemed out of the ordinary. I tried to log on as Administrator and got an error message saying that the domain is missing. I tried another network connection and cable but no network. I updated the Symantec program and ran it. There were 6 Trojan.Riler viruses and Symantec deleted them. I restarted the computer and then the administrator login worked and the domain controller was found. Why the local domain was blocked but the internet worked is a mystery. But now the computer accesses the network drives and everything seems to be back to normal. The files that were infected were (4) mmchost.dll and (2) 90.exe files in C:\windows\system.32 directory

Symantec did find them after update but not before?

What version is there installed?