Not able to install two diff. OS in one laptop

Raja_28

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Jul 22, 2017
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My pc is running with win10 and some software's are not installing, so i want to install win7 as another OS. The problem occured during the installation of win7 is that it's sayinh "windows cannot install in this hard disk as this is of GPT partition style". I don't want to use diskpart method as it will erase all the data in my hard disk. I tried partition assistant to change the disk type from GPT to MBR but that also didn't work as it is saying that some disks are using by another program.
SO ANY SOLUTION??
 
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