Partition Wizard is generally a fine tool, but.............................in my opinion, you'd be crazy to not back up your data first in case it fails you, for whatever reason.
Personally, I'd backup my data and delete all partitions, and then do a clean install using GPT, then restore data.
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I am using a tool called EaseUS Partition Master. It’s a free multifunction partition management software. This tool’s feature can help you convert a disk with data into GPT or MBR style without data loss. How to Free Convert MBR Disk to GPT Disk without Data Loss - EaseUS