Avast says that this file is infected

File C:\Windows\system32\rpcss.dll **INFECTED** Win32:Malware-gen Service DcomLaunch [C:\Windows\system32\rpcss.dll] **HIDDEN**

But VirusTotal tells it is all clean

C:\Windows\System32\rpcss.dll [2013-11-21 16:20] - [2010-11-20 09:27] - 0512000 ____A (Microsoft Corporation) [b]5C627D1B1138676C0A7AB2C2C190D123[/b]

https://www.virustotal.com/en/file/c5003f2c912c5ca990e634818d3b4fd72f871900af2948bd6c4d6400b354b401/analysis/

Describe the problem with boot windows.