convert mo yung drive mo to gpt, habang nada bootable drive ka press mo shift+f10, mag oopen yung command prompt then may command na pang convert ng mbr to gpt, nasa google paki search nalang.
I think ang problem mo is yung OS kaya ulitin mo na lang by using Rufus.
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Note:
Make it sure na ang OS mo eh hindi corrupted otherwise mag e-error lang.