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LuComServer_3_4.exe running in background slows system down and uses 90 % of processor time after startup.

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  • Anonymous Apr 18, 2008

    Same problem. LuComServer_3_4.exe runs at startup and continues to run. It consumes approximately 90% of CPU time except when LuCallBackProxy.exe interjects and consumes 90% of CPU time. This issue only started to occur after 31 March 2008. What the hell did Symantec do to my product?

    I've disabled "Turn on protection for Norton products" which apparently has reduced the occurrences of LuCallBackProxy (typically zero) however, the issue regarding LuComServer_3_4 remains.

    Until now I've been ok, but never satisfied with Symantec. Unfortunately, now I'll be switching to another product at renewal time.

  • Anonymous Nov 24, 2008

    My Computer stays at 100% sometimes down to 90%. I'm crawling. Help.

  • Anonymous Dec 20, 2008

    this is a nightmare!

    solution: uninstall

    and switching to AVG to solved it

  • Anonymous Jan 28, 2009

    Luconserver_3_4.exe process runs cpu 99%

  • Anonymous Mar 24, 2009

    i have the same 100% cpu prob...the only diff is i have uninstalled all norton products still its there.....plz help


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The solution is simple.the problem is coming up from Live update of either you turn off automatic updates in norton or if you don;t have it unistall live update software.

Posted on Oct 22, 2009

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U need this software or not.
if not then is this virus activity?
reply me try my best to give u solution.

Posted on Apr 03, 2008

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SOURCE: LuComServer has taken over my puter....

run an antivirus scan with powerful antivirus and access your computer using safe mode, clean registry using some reliable cleaner such as reginout cleaner. thanks

Posted on Jul 04, 2011

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LuComServer_3_4.exe is a virus program.
Shut off Automatic Updates and the System Restore.
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This will remove the memory hog infection.
For more help, go to

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i) see it depends how application(fire fox) is using CPU or processor, even though nothing is running in the background, firefox will utilize CPU(like background work with going between firefox and CPU or processor which we may not intercept......)

ii) if u are so curious about why it is i will ask you to see a process in Task Manager called "System Idle Process" which will consume about 99 or 90 %(which is a process is not required or doesnot have anything to applications but still it will 99 or 90% percent of CPU) see it has background work with CPU or processor which is not understandabl e by a common person...

iii) i u still think that this is not the right answer try to uninstall fireforx and renistall and check it,  or try some other browser like opera and check whether it is upto your expectations and continue using it and maintain some peace of mind .........

Thankin you

M. Sridhar

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