Unofficial downloads often hide trojans, keyloggers, or spyware within the executable.
Would you like a step-by-step guide to installing and using instead? Microsoft Office 2003 - Portable Version full version
But downloading such a version exposes you to: Unofficial downloads often hide trojans
If you're having trouble finding a portable version of Microsoft Office 2003 or prefer a more modern alternative, consider: Microsoft Office 2003 - Portable Version full version