DCom Server Process Launcher (DComLaunch) service was introduced in Windows XP SP2. One of the major side-effects user face after disabling the DComLaunch service is that the Disk Defragmenter console fails to operate. The Analyze and Defragment buttons do not work. Also, launching the console Defrag (defrag.exe) utility causes the following error:
Enable the DCOM Process Launcher Service
1. Click Start, Run and Type Services.msc
2. Double-Click DCOM Server Process Launcher
3. Set Its Startup Type to Automatic
4. Restart Windows.
Windows Firewall service may fail to start after disabling DComLaunch. See KB892504 titled The Windows Firewall service cannot start if the DCOM Process Launcher Service is disabled.
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Ramesh Srinivasan founded Winhelponline.com back in 2005. He is passionate about Microsoft technologies and has a vast experience in Windows — delivering support for Microsoft's consumer products. He has been a Microsoft MVP (2003-2012) who contributes to various Windows support forums.