QTNetComp.dll is one of the important DLL file of any Windows system, this file is responsible to maintain Windows operating system effortlessly. A single DLL file is used by lots of.exe file to execute their task and confirm that the operating system can access the accurate data. But once a DLL file gets inaccessible due to any reason then system can display several types of DLL errors. So to deal with such types of DLL error you need to make this file accessible by the Windows.