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SNDSrvc.exe

What Is It?
Norton Security - SNDSrvc.exe

What Does it Do?
SNDSrvc.exe - This is one of MANY processes that are used by Norton Security (AV + Net Security) If its under the appropriate directory you'll have nothing to worry about. If you're experiencing slowdowns you'll want to upgrade your hard drive and/or your RAM. Norton is a resource hog.
This process is known as Symantec Network Driver Service. Google isn't revealing any specific information on this. Please let me know if you find a good source of info on this.
Virus Precautions:
The normal location of SNDSrvc.exe is: C:Program FilesNorton AntiVirusSNDSrvc.exe