iyi akamlar ben teknosadan casper diz st bilgisayar aldm alal 9 ay oldu bana windows ile ilgili hic bir rn anahtar verilmedi ben rn anahtarn nerden temin edebilirim

Product key is hidden in BIOS. This is standard procedure.

rn anahtar BIOS gizlidir. Bu standart bir prosedr.

ben windowsumu gncellemek istedii zaman rn kodu istiyor tekrar 0 dan kurulum yapamyorum cd istiyor ben nerden bulabilirim rn anahtarn

Hi emre,

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Best regards 

You can create a new Windows 8.1 installation media, please take a look at Create Media. The product key may be hidden in the BIOS or there may be a label somewhere on the computer. 
Should the product code not activate windows, you can Get Help Activating Microsoft Windows.