My computer crashed and now microsoft office 07 wont work

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I would probably run the following before doing anything else. It may take over an hour to run.

http://www.informit.com/articles/article.aspx?p=1718476&seqNum=5

https://support.microsoft.com/en-us/help/924611/how-to-install-the-individual-2007-office-features-or-to-repair-the-in

If the above does not work, try the below. It may be a bit difficult to determine which system restore might contain the working setting for the 2007 Office as you may have generated several restore points in attempting to reinstall it. If you go back too far, the program won't be available or recoverable. Avoid going back to a point prior to its installation but walk it back to a date where it was working. That is, choose such a system restore point. This may work around your problem with reinstallation.

I am not sure how you are reinstalling the 2007 Office. Did you uninstall it and then attempt to reinstall it or did you try to reinstall it over top of the existing corrupted version? And from what source? If you have an installation file and the software key, you might uninstall the program with something like Iobit Uninstaller or Revo Uninstaller, then try fixing disk errors with Glary Utilities (if you can find a version compatible with your OS). Afterwards, try installing the program from Safe Mode.

Regarding reinstallation attempts, surely it requested the "key" each time you attempted reinstallation. Before you try anything else, you might run Magic Jelly Bean and Belarc Advisor to see what the programs pull up in terms of the serial number (key). If you can't find it, you know why your 2007 Office didn't run.