As we know, Windows 7 has been quite popular there. But if you want to try Windows 7 on your netbook which has no Drive or a Notebook with Combo Drive, it will be a kind of pain.
However, actually, it is not so difficult to make a clean install of Windows 7 without a DVD Drive.
* Download the Windows 7 RTM ISO
* Use Winrar (3.8 or Higher) to unzip the ISO to a non-system disk. Here take D: for example. Or mount it with a Virtual Driver like Daemon Tools
* Restart your computer and press F8 during startup
* Hit repair my computer and then command prompt
* Type in D:7600sourcessetup.exe and hit Enter
* Now you will see the install screen. Hit Custom Install
* Hit Advanced and format
* Now go ahead to do a clean install
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