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What if win7 is installed on win 10 and the black screen shows unsigned?
Solution:

1. First, record the file information that appears at startup. "c: \ windows \ system32 \ drivers \ amd _ xata.sys.sys" appears here in Bian Xiao;

2. Restart the computer and press F8 repeatedly when the system enters the boot screen to open the advanced startup menu;

3. Select "Disable driver signature compulsion" in the advanced menu and press enter to enter the system;