Why does the antivirus portion of my McAfee's Security Center go offline all of the time?

My McAfee's antivirus goes offline a lot.  Not all of the time but a lot.  I turn it back on and then I will notice that it is offline again when I get a pop up indicating that my computer is unprotected.  I scanned the computer with McAfee after bringing it back online and nothing was found.  Generally, I run Combofix but it seems to be off line now.  I asuume that this is a virus but nothing shows up.
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Thomas Zucker-ScharffConnect With a Mentor Systems AnalystCommented:
AFAIK, the new version of combofix is in beta right now.  You can find it at:

http://download.bleepingcomputer.com/sUBs/Beta/KittyFix.exe  Note that it is Beta, it will probably go live soon.

Have you tried running Malwarebytes with the download renamed to mb.exe before saving?

elentiniAuthor Commented:
This worked although Combofix didn't indicate that anything attached to the machine.  This brings up the question as to why my virus software doesn't stop these things from coming in?  Is there a virus scan tool that works better than most or is this the best that we can expect/

elentiniAuthor Commented:
Thanks for the help.
Thomas Zucker-ScharffSystems AnalystCommented:
Neither Mcafee nor Symantec make the best tools.  Althought the new Symantec Endpoint Security is better than previous solutions.  SuperAntispyware (www.superantispyware.com) is an excellent solution as is malwarebytes (www.malwarebytes.com).  Either one of those in paid version is better.  Avast and Avira are also very good solutions although not as complete.

AVG9 does just about everything, but it BSOD'd (blue screen) my machine and I believe it was the rootkit component.  Others have had better luck, YMMV.
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