Hi I'm running XP SP3. I use Firefox as default. I've a bug that launches two or three copies of IE into the services (they don't immediately appear on screen). After a few minutes it preforms one or more of the following: Displays adverts in an IE window Plays an audio advert (not sure how it does that) Mutes the sound completely. I've run the latest versions of ad-aware & avast anti virus but with no luck. Using Sysinternals Process Explorer I can see the following: (> represents a child service) System>smss.exe>csrs.exe>winlogon.exe>services.exe A child of this is svchost.exe that has the command line of: CWINDOWS\system32\svchost -k DcomLaunch A child of this is iexplore.exe that has the command line of: "CProgram Files\Internet Explorer\IEXPLORE.EXE" -Embedding A child of this is another one or two copies of iexplore.exe with the command line of: "CProgram Files\Internet Explorer\IEXPLORE.EXE" SCODEF752 CREDAT:145411 or 145412 Using Sysinternals Autoruns I disabled DcomLaunch & rebooted. It prevented the problem, but it appears DcomLaunch is essential for Windows to run. I've run out of ideas for a solution, so it's over to you. Any ideas? Hope I've been clear. Cheers Dave F.