Install Windows 7 without a DVD (easy way)

1. Download and install "Windows 7 USB/DVD Download Tool" from Microsoft's web site.  The program has only 2MB. 
Hint: instead of the above mentioned tool you can also use this one.

2.  Get the Windows 7 ISO file

3. Start "Windows 7 USB/DVD Download Tool". It will ask you where is the ISO file. Show it and let it write it on your USB stick. The stick needs to be at least 2.5 GB. All files on it will be deleted. It will take about 3-5 minutes to copy the ISO file on your stick. When done, just take the stick and put it in the computer where Win7 needs to be installed..

4. Boot from your USB stick and start installing Win7. 
Hint: To boot from your USB Flash, usually you need to restart the computer and press the Escape, Delete, Home or F2 (F2 works with Assus EEEPC) key immediately after restart. If it doesn't work, do a Google search to see how you can change boot order for your computer (brand). 

5. Install Windows 7 

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There are other ways to write the Win 7 ISO to a stick without using "Windows 7 USB/DVD Download Tool" tool, but it is more complicated: 
http://www.intowindows.com/how-to-install-windows-7vista-from-usb-drive-detailed-100-working-guide/
http://www.blogsdna.com/2016/how-to-install-windows-7-from-usb-drive-without-windows-7-iso-dvd.htm