
Messenger Service Spam comes in standard Windows dialog boxes with advertising content using any NetBIOS port:
Messenger Service
Message from < source > to < target > on < date time >
< Message Text >

Actually, Messenger Service was created for administrators to send warning or notifying messages for network users. If Messenger Service Spam messages started popping, that is a matter of great concern. Even if the Messenger Service itself cannot affect you system as viruses do, it can be a distribution source of spyware and viruses. First what you have to do is turn the firewall on and disable Windows Messenger Service (see instructions below).
"Messenger spam":
Message from SECURITY to ALERT on 1/29/2007 7:35:48 PM
STOP!
Registry Cleaner Recommended!
To fix the errors please do the following:
1. Download Registry Repair from: http://www.regwinclean.com
2. Install Registry Repair
3. Run Registry Repair
4. Reboot your computer
FAILURE TO ACT NOW MAY LEAD TO DATA LOSS AND CORRUPTION!
STOP! WINDOWS REQUIRES IMMEDIATE ATTENTION.
Windows has found CRITICAL SYSTEM ERRORS.
Run Registry Repair from: http://fixwin32.com
FAILURE TO ACT NOW MAY LEAD TO DATA LOSS AND CORRUPTION!
STOP! IMMEDIATE ATTENTION REQUIRED
Windows has found CRITICAL SYSTEM ERRORS.
Download Registry Cleaner from: www.clean32.com
FAILURE TO ACT NOW MAY LEAD TO DATA LOSS AND CORRUPTION!
Messages can contain the following websites:
www.clean32.com,
www.cleanthepc.net,
www.correctreg.com,
www.fixregs.com,
www.fixwin32.com,
www.helpfixpc.com,
www.key32.com,
www.msreg.com,
www.myregfix.com,
www.patchreg.com,
www.pathupdate.info,
www.pcregistryfix.com,
www.regdoc.com,
www.regdoc32.com,
www.regdocpro.com,
www.regfix.info,
www.regfixit.com,
www.registrycleanerxps.com,
www.registryrepairxp.com,
www.registryupdates.com,
www.registyrcleanergold.com,
www.regpro32.com,
www.regrinsepro.com,
www.regscan.com,
www.regscan32.com,
www.regscans.com,
www.regupgrade.com,
www.regwinclean.com,
www.regwinrepair.com,
www.scanmyreg.com,
www.set32.com,
www.sysdow.com,
www.theregfixer.com,
www.tocleanpc.com,
www.wincleaner32.com,
www.windowsrepair.net,
www.windowsxpcleaner.com
Messenger Service warnings:
How to disable the Messenger Service (Windows XP):
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Go to Control Panel.
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Open Administrative Tools folder.
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Double click Services.
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Double click Messenger

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In the Startup type list choose Disabled

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Hit the button Stop and wait till messenger will be stopped:

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Finally click OK