Check if your processor is x86 (32-bit) or x64 (64-bit)

Method 1: Using Regedit

Go to Start -> Type regedit

Browse to HKEY_LOCAL_MACHINE\HARDWARE\DESCRIPTION\
System\CentralProcessor\0

From ProcessorNameString you will be able to see the name of your processor and from Identifier you will see the family of the processor and if it has 64 then it is 64-bit capable.

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Method 2: Using MSINFO32

Go to Start -> Type msinfo32.exe

From the System Information page under System Type you will find as x64-based PC.

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Method 3: Using CPUZ

Download CPUZ

CPUZ is a small utility which gives all information about your CPU (Processor), Cache, Mainboard, Memory, SPD etc.

Under Instructions from CPU tab, if you see EM64T (if its Intel) or AMD64 (if its AMD) then your processor is 64-bit capable