I want to come back to windowas 7 instead of 8 .Should Ipurchase a new windows 7 or can I downgrade

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After spending a lot of time and some money I found out that it is very difficult to get rid of apps in windows 8 in my new pre installed windows8. Now I want to downgrade my windows to 7.Should I buy a new windows 7? or I can downgrade mine from windows
8 to windows 7 for free?.If I can downgrade to 7 How can I find the serial no of my existing windows 8?My computer came to me with no CDS!BestReza

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