My iMac keeps on diconnecting from my network and The internet is very slow on it too.

Hi
My iMac has been acting wierd for the past month. It has been disconnecting from the internet/network and also it has a very slow speed when using Safari or any other internet application (eg. Skype). Im not sure why this is happening. My iMac has Windows installed (100GB partioned) and yet the internet is fast on it than the Mac side. On other computers and mobiles the internet is very fast, and does not disconnect. I scanned my computer and it came up with nothing.
Please Someone Help...

If you connect to your router with with Wi-Fi, please try connecting with an Ethernet cable. Turn Wi-Fi off and test. Any difference?

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http://support.apple.com/kb/TS1398
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 com.apple.network.identification.plist
com.apple.wifi.message-tracer.plist 
NetworkInterfaces.plist 
preferences.plist
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My iMac keeps on diconnecting from my network and The internet is very slow on it too.

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