1. Press the Windows + R keys to open the Run dialog, type msconfig, and click/tap on OK.
2. If prompted by UAC, then click/tap on Yes.
3. Under the Boot tab in System Configuration, click/tap on the Advanced options button, and do step 4 or 5 below for what you would like to do. (see screenshot below)
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4. To Have Windows Use All Installed Memory
NOTE: This is the default setting.
A) Uncheck the Maximum memory box, click/tap on OK, and go to step 6 below. (see screenshot below)
NOTE: If the box is not checked, then it does not matter what the selected number is since Windows will use all available RAM by default and ignore whatever value is in the box underneath.
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