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Right-click on the Start.
Left-click on System.
There will be an entry under System called System Type listed. If it lists 32-bit or 64 bit Operating System
TO KNOW WHICH SYSTEM IS 32 BIT OR 64 BIT, WE FIRST HAVE TO SELECT MY COMPUTER ICON IN THE DESKTOP SCREEN ,THEN RIGHT CLICK ,THEN GO TO PROPERTIES. IT WILL DISPLAY THE REQUIRED INFORMATION .
