While start setup error given - .exe is not a valid win32 application

Hi Jayesh,

Do you mean you are trying to install the new Office on your Windows XP computer? Could you please share the detailed steps on how you did this?

As far as I know, Windows XP is not a supported operating system for Office 365, you need at least Windows 7 or later for the new Office:

https://products.office.com/en-us/office-system-requirements

Regards,

Ethan Hua
TechNet Community Support