To make things easier on the kid.... go to http://rarlabs.com and download winrar...
Right click the iso and click extract. This will extract all the files into the folder...
For daemon tools
Go to http://www.daemon-tools.cc and download it...
Once it has restarted and downloaded you should see a new icon in the task bar.
Rigfht click it>Virtual cd/dvd/select the drive>open the iso...
Daemon tools installed a new "fake" cd drive on your computer and by selecting the iso it makes your computer think that there really is a cd in that drive. Easy...
But the winrar one sounds easier IMO
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