how do you uninstall windows 7 and use a new windows 7 key

LechTips

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Jun 30, 2014
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all i see on google is
how to uninstall windows 7 and instal xp
or uninstall windows 8 to windows 7
im yet to see windows 7 to windows 7
 

LechTips

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Jun 30, 2014
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i used my freinds window 7 key when we made my gaming pc
but i got BSOD for error code 0x00001a later i found out that windows didnt properly install
so i assume your not suppose to use the same license key twice