DLLHost.exe
(Microsoft)
DCOM support module for DLL based COM objects (DCOM = Distributed Component Object Model). DCOM is a software architecture model which is an intrinsic part of Windows, of most Microsoft products, and of many non-Microsoft products. In most cases you should never see DLLHOST in your Task List, as, typically, DLLHOST starts, does what it has to do, and then terminates. However, sometimes, if a Java COM object runs (this could happen if you are browsing the Internet and come to a page which has Java code), DLLHOST may not terminate, which is when you would see it in your Task List.
Recommendation :
Do not "End Task" it as there is no way to determine whether DLLHOST has completed its task or not. For the more advanced users , however, deleting the registry key "HKEY_LOCAL_MACHINE\SOFTWARE\ Microsoft\Java VM\MSDebug" can often solve the problem of DLLHOST constantly appearing in the Task List.