Trulli
As long as you make sure your computer can be compatible with 64-bit operating system, you can upgrade your Windows 7 32 bit. To upgrade Windows 7, the best way to clean install Windows 7 64 bit. During the process, it will remove the existing operating system and replace it with a new operating system. Thus, there is a risk of data loss. To avoid it, you need to backup your system before upgrading.

Check system type of your computer


To make sure you can successfully clean install Windows 7 64 bit, the first thing is to check the system type of your computer. If the system type is x64-based PC, you can upgrade Windows 7 32 bit to Windows 7 64 bit. If the system is x84-based PC, you cannot upgrade your Windows.
To check system type:
Step 1. Open the Start menu.
Step 2. Search for System Information and press Enter.
Step 3. Look for System Type.