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To adjust the size of the pagefile.sys using PowerShell, follow these steps:

1. Open PowerShell as an administrator.

2. Type the following command to get the current pagefile configuration:

   Get-WmiObject Win32_pagefilesetting

3. To set a new pagefile size, use the Set-WMIInstance cmdlet with the Win32_PageFileSetting class. The Set-WMIInstance cmdlet will update the values specified for the pagefile settings. Here is an example command that sets the minimum, maximum, and initial pagefile sizes to 1024 MB:

   Set-WMIInstance Win32_PageFileSetting -Arguments @{name="C:\pagefile.sys"; InitialSize=1024; MaximumSize=1024}

   Replace "C:\pagefile.sys" with the path of your pagefile if it is located elsewhere on your system.

4. After running the command, verify the changes by running the Get-WmiObject Win32_pagefilesetting command again.