Upgrade Windows 7 32 bit to 64 bit without Losing Data Step 1: Check the current hardware's compatibility. ... Step 2: Backup files to external hard drive to prevent data loss. ... Step 3: Upgrade Windows 7 32 bit to 64 bit free (Clean Install) ... Step 4: Activate Windows 7 64 bit to reuse product key. More items... Jan 12, 2023