Hi,
Please check if the method in the following link and change the "enable" to "disable" could help:
https://support.bluestacks.com/hc/en-us/articles/115003174386-How-to-enable-Virtualization-VT-on-Windows-10-for-BlueStacks-4
Please note: Information posted in the given link is hosted by a third party. Microsoft does not guarantee the accuracy and effectiveness of information.
Thanks for your time!
Best Regards,
Anne
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