Error in installing RHEL v5.11 workstation

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Im trying to install RHEL v5.11 workstation in my HP elitebook 745G6 laptop. But im getting 'ACPI Error: DMAR not present error'. Im installaing from bootable USB with legacy mode and due to some reasons im unable to use the latest version of RHEL.

Kindly let me know how to solve this error and proceed the installation.

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