I believe it is a windows process that manages dcom
where is the exe located?
edit : found this using google
Process name: DCOM DLL host process
Product: Windows
Company: Microsoft
File: dllhost.exe
Security Rating:
The COM+ hosting process controls processes in the Internet Information Services (IIS) and is used by many programs. It loads .NET Runtime for example. There can be multiple instances of DLLhost.exe.
Note: The dllhost.exe file is located in the folder C:\Windows\System32. In other cases, dllhost.exe is a virus, spyware, trojan or worm!
so basically if it is anywhere but system32 folder I suggest you start running virus scans