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Open a command prompt ( dos window ), by selecting
START >> RUN
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type in the letters CMD and press OK
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type in netstat -a and press enter to show you all connections to your PC
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you should see a list of all connection your PC is making, locally as well as remotely.
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This image shows some typical connections that your PC may display when running netstat -a
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type in netstat -ab and press enter, this will show you what programs are making the connections
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you may have to wait several minutes for all the connections to display and you might be amazed at what you see.
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some connections you see will be obvious, iexplorer.exe is Internet explorer
if you see iexplorer.exe and you don't have Internet Explorer open, then you probably have a Trojan.
if you see a program making any UDP OR TCP request to remote destination, you can search google or yahoo
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