How can I change 32-bit to 64-bit without formatting?

Upgrade Windows 7 32 bit to 64 bit without Losing Data

1. Step 1: Check the current hardware’s compatibility. …
2. Step 2: Backup files to external hard drive to prevent data loss. …
3. Step 3: Upgrade Windows 7 32 bit to 64 bit free (Clean Install) …
4. Step 4: Activate Windows 7 64 bit to reuse product key.