Extracted files from office 03 trial won't work

[SidB]

I downloaded office 2003 trial from Microsoft website which is a self-extractor archive installer.

I tried to extract files from the archive so that I can install without it, but extracted files won't work correctly: I can run extracted setup, but at one stage during install , an error pops out and says install can't continue further. No error occurs when I run the install from the archive.

Where can the problem comes from? Am I extracting files incorrectly.

Please help me on that. It's been a while I've been looking around for a solution.

Thanks

If you need me to give exact error message, or a screenshot, let me know