how to distinguish fake windows

Which version windows?

There are a few ways you can tell.
Read this: Genuine Windows: frequently asked questions - Microsoft Windows
Its will answer all your questions.

But, if you want to you can do a validation test.

Vista/7 Start > Control Panel > All Control Panel Items > System. Under "Windows Activation" it will tell you if its genuine or not.

Windows XP Start > My Computer > Help > "Is this copy of windows genuine"

The WGA (Windows Genuine Advantage) is the way to check if its genuine (can be annoying tho)

Validation Test
http://www.microsoft.com/genuine/validate/validatenow.aspx

click validate now on this site and it'll install a active x which checks if your windows is genuine.
 
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