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pagefile
In storage, a pagefile is a reserved portion of a hard disk that is used as an extension of random access memory (RAM) for data in RAM that hasn't been used recently. A pagefile can be read from the hard disk as one contiguous chunk of data and thus faster than re-reading data from many different original locations. Windows NT administrators or users can reset the system-provided default size value of the pagefile to meet their particular needs.
In other operating systems, the pagefile is called a swap file or a swap partition.
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Clear Pagefile at shutdown
Windows does not clear the pagefile when the computer is shutdown, and for a computer with lots of users and documents, it becomes risky if the pagefile is not cleared once on a while. This tweak will help you solve this problem
Click on START > RUN > and type REGEDIT
1. Navigate to HKEY_LOCAL_MACHINE\SYSTEM
CURRENTCONTROLSET\CONTROL\
SESSION MANAGER\MEMORY MANAGEMENT
2. Double click on ClearPageFileAtShutdown and change the value to 1
3. Exit the registry and restart your PC