Linux locked my hard drive

[Soroush20]

I accidentally installed Linux on my hdd where my c drive was and now It locked my PC and I inserted a dvd for installing windows but it says that drive where windows installed is locked .I used old windows 7 dvd and it doesn't recognize my hdd and says there is no drive to install windows on it.I know my hdd was healthy before this . Please please help me.I'm dying out of anxiety ***moved from Windows / Windows 10 / Performance and system failures***

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