Is my machine 64bit?

There are many softwares which works differently on a 64bit machine and on a 32bit machine.Thus it is very important to choose the type of downloads which best suites your machine.If you are using MS Windows here are some of the ways to determine.

If you are using windows vista/2007
If you have Windows Vista, there are two methods to determine whether you are running a 32-bit or a 64-bit version. If one does not work, try the other.
Method 1: View System window in Control Panel

   1. Click Start , type system in the Start Search box, and then click system in the Programs list.
   2. The operating system is displayed as follows:
          * For a 64-bit version operating system: 64-bit Operating System appears for the System type under System.
          * For a 32-bit version operating system: 32-bit Operating System appears for the System type under System.

Method 2: View System Information window

   1. Click Start type system in the Start Search box, and then click System Information in the Programs list.
   2. When System Summary is selected in the navigation pane, the operating system is displayed as follows:
          * For a 64-bit version operating system: x64-based PC appears for the System type under Item.
          * For a 32-bit version operating system: x86-based PC appears for the System type under Item.

If you are using windows XP
If you have Windows XP, there are two methods to determine whether you are running a 32-bit or a 64-bit version. If one does not work, try the other.
Method 1: View System Properties in Control Panel

   1. Click Start, and then click Run.
   2. Type sysdm.cpl, and then click OK.
   3. Click the General tab. The operating system is displayed as follows:
          * For a 64-bit version operating system: Windows XP Professional x64 Edition Version < Year> appears under System.
          * For a 32-bit version operating system: Windows XP Professional Version appears under System.
      Note is a placeholder for a year.

Method 2: View System Information window

   1. Click Start, and then click Run.
   2. Type winmsd.exe, and then click OK.
   3. When System Summary is selected in the navigation pane, locate Processor under Item in the details pane. Note the value.
          * If the value that corresponds to Processor starts with x86, the computer is running a 32-bit version of Windows.
          * If the value that corresponds to Processor starts with ia64 or AMD64, the computer is running a 64-bit version of Windows.

If you are using Windows Server 2003
If you have Windows Server 2003, there are two methods to determine whether you are running a 32-bit or a 64-bit version. If one does not work, try the other.
Method 1: View System Properties in Control Panel

   1. Click Start, and then click Run.
   2. Type sysdm.cpl, and then click OK.
   3. Click the General tab. The operating system is displayed as follows:
          * For a 64-bit version operating system: Windows Server 2003 Enterprise x64 Edition appears under System.
          * For a 32-bit version operating system: Windows Server 2003 Enterprise Edition appears under System.

Method 2: View System Information window

   1. Click Start, and then click Run
   2. Type winmsd.exe, and then click OK.
   3. When System Summary is selected in the navigation pane, locate Processor under Item in the details pane. Note the value.
          * If the value that corresponds to Processor starts with x86, the computer is running a 32-bit version of Windows.
          * If the value that corresponds to Processor starts with EM64T or ia64, the computer is running a 64-bit version of Windows.