Windows XP updates files with the last access update time when they are opened by any application. It’s useful at all, here’s a way to deactivate it.

For Windows Vista it’s not necessary because it’s set as the default automatically, Even when you upgrade from XP to Vista.

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Manual Registry Tweak:

Go to run dialog box from the start menu, and move down to the following key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\FileSystem

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Reset a DWORD value in the right side called NtfsDisableLastAccessUpdate and gives it a value of 1. To get rid of this tweak remove the key or reset value to 0.

To make it effective reboot the system.

Download Registry Tweak:

Download and extract the file and double-click on DisableLastAccessUpdate.reg file to type the information into the registry. There’s a removal script included as well.