How to convert 64 bit to 32 bit windows 7 pc ?

I want without format solution can you give me.

The main consideration with using a 64bit OS is the amount of RAM the machine has installed.

If you have 4GB or more RAM then a 64bit OS is the best option.

You need to reformat the HDD for a 'clean' install.

Boot from the 32-bit Windows 7 installation DVD.

Follow through the installation steps and enter your product key for the 32-bit Windows 7 installation DVD.

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I will do it then I will answer you is this running or no & thanks for your valuable answer to my query

Sorry, is not other way.

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PS

What do you hope to gain from using 32 bit software? ? 

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Windows does not support upgrade between architectures. Therefore, only clean install is possible. You can format the hard drive and install Windows x64 or install it parallely or you can use a set of commands to edit bcd store and perform clean installation just like in a new hard drive.

For installing without formatting:

Insert the Windows 7 x64 installation media and boot from the media.

Click on Repair your computer. You can then see System Recovery Options dialog (second image). Once the desired Windows installation is selected, you can see System Recovery Options dialog (first image). Click on Command Prompt.

Once done, type bcdedit and press enter.

You can find a set of options like this:

Note the identifier value under Windows Boot Loader.

Type Bcdedit /delete {boot loader identifier} and press Enter.

Note that the identifier must be entered inside { }. If it is mentioned as current, enter current.

Once done, type the following commands and press enter, after each command: <if the 32-bit Windows installed drive is C:, enter C: otherwise, enter the suitable drive letter>

C:

*cd*

rename Windows Windows.old

rename "Program Files" "Program Files.old"

rename Users Users.old

del pagefile.sys

del hiberfil.sys

Once done, you can start installing Windows 7 x64 in the same partition where Windows x86 was installed. You can delete the folders Windows.old and Program Files.old later. You can also delete users.old folder later after taking a backup copy of your personal/important files from the folder.