How do I know - 32 Bit OR 64 Bit

How do I find out if my PC is a 32 bit or 64 bit ?

I want to get windows vista & need to know which version of vista my pc will handle.

I would like to get the Ultimate Edition.
My 2 PCs have following configuration ;

(1) Dell dimension 8300

P4 2.6 GHz ( HT )

Intel 875 P Mother Board

512 MB DDR

250 GB SATA HDD

Win XP Pro SP2

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(2) Dell Optiplex GX 620

P Dual Core 3.0 GHz

Intel 945 G Mother Board

2 GB DDR2

2X250 GB HDD

Dual Monitor Card

Win XP Pro SP2

Thanks
Mike

 

To find out what your processor architecture is, please do the following:

1. Hit windows key + r (or click Start --> Run)
2. Type 'cmd' (without the quotes)
3. Press enter (or click 'OK')
4. Type 'echo %processor_architecture%' (without the quotes)
5. Press enter

The command shell will now return the value of the processor_architecture environment variable. If it says x86 then you are on a 32-bit system. If it returns x64, then you are on a 64-bit system.

 

Thank You.

That was very helpful.

Mike