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No, it is not advisable to “pull the plug” if your computer freezes. The “shock” of pulling the plug on a working computer could cause the hard drive to crash or malfunction.
The safe way to close down the computer is to hold down the CTRL, ALT and DELETE keys simultaneously, which will bring up the Windows Task Manager. This “tool” allows you to close the troublesome program or programs and then continue working on your computer without closing down your system. It also has an option to ‘Disconnect’ or ‘Logoff’ under the ‘Users’ tab.