Svchost.exe is SIGNIFICANTLY slow down my computer

Hello, I recently went on vacation last week and a half before hand, I shut down my computer, so there are no memory leaks for my era [6 days].  I came home and turned on the computer which ran fine for awhile.  But then my computer started to act, because every once and a while, but this lasted since I got home.  Norton is my anti-virus and continues to tell me that "svchost.exe" using a lot of memory.  I must have at least 15 + svchost.exe process open for what reason so ever.  3 of which are in high use [one to 70,000] and the second at 20,000 and the other 10,000.  The first two [70 000 and 20,000] are both in the category of user name of the 'system' and the third one [10 000] is in the category of user name "Local Service".  I need help to solve this.

I was wondering if it could be a virus/Trojan horse that has affected the svchost.exe program?

It can also be a good idea to start safe mode and check your memory usage
so that the Safe Mode on minimum processes.
http://Windows.Microsoft.com/en-us/Windows7/start-your-computer-in-safe-mode?SignedIn=1
Clean boot is another useful troubleshooting tool-
How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7

If you find anything when running via boot-
While most the VA is supposed to detect spyware, but also viruses/malware
Spyware Search and Destroy specializes in spyware detection and maybe another reference useful.
It would seem that if you have spyware using a lot of RAM, then it would
also use some cpu resources because it sends its information on the net.
.
http://www.safer-networking.org/DL/

BTW - I've never had malware/spyware in ten years of using a PC (had
false positive since my AV well), but I do not use torrent sites, social networks or open unwanted e-mails that are the main source of bad things.
Your problem may be something else, virus, etc. are known to install at the re-start and can be installed in the boot sector of the HARD disk where they are very difficult to remove.

Tags: Windows

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