I attempted to install Microsoft Office 2007, and got this error code:

Installation Failure: Windows failed to install the following update with error 0x80070643: 2007 Microsoft Office Suite Service Pack 1 (SP1).

How do I solve this?

Seems like invalid security settings. Let's try this:

Please navigate to this webpage: http://support.microsoft.com/kb/313222 and see the section "Fix it for me" and click the Microsoft Fix-It button. This will download a fix utility to repair the security settings on your computer, due to damages of malware or other harmful system changes. Install the file after download.

umm..i got the same issue, but that method did not work, ryan. would you like to help me too????

Ok.

Try to reinstall Microsoft Office.

Do you have your product key?

Do that and let me know how it goes.