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SVCHOST.EXE using lots of memory

Hello All,

My Dell Studio XPS is having some perfomance issues.  When I take a look at the Task Manager, I see multiple instances of SVCHOST.EXE.  (Please see the attached file.  The highlighted line is the instance that is using the most memory. ) I've checked the location of the file and with a Windows search and only one file shows up named 'svchost.exe'.  That file is located in C:\Windows\System32.  
 
Killing this instance in task manager does not work since it restarts in a matter of seconds.  I've done a scan of this file and the windows directory with my anti-virus software but it reported no infections.  Could I have an infection nonethess?  If so, how can I get rid of it?  If it is not a virus, then how do I fix this bloated instance?
svchost.docx
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Adam Leinss
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I would suggest using Process Explorer which will allow you to "drill" into SVCHOST to find out the exact service using that amount of memory:

http://technet.microsoft.com/en-us/sysinternals/bb896653.aspx
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The performance issues manifest themselves while I am working in Word and am playing .mp3 files using Windows' Media Player.   There are noticeable disruptions when the songs are being played.  (The music stops but then starts up again.)

I have downloaded and executed "Process Explorer"  What should I be looking for and is it normal to have so many instances of SVCHOST.EXE?
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It appears that I was just "crying wolf".  The CPU usage is now fluctuating between 0 and 1 per cent which is normal when no applications are running.  Also, the instance of the SVCHOST.exe's memory usage is now down significantly.   I have run a full scan for viruses which ultimately reported none.  There simply may have been too much running on my machine and I panicked.   Thanks to every one for your assistance.