Setup cannot find office.en-us/dwtrig20

Heyy..if u encounter this problem then just go the folder and open the file whichever ur setup cannot find and then retry.for example if ur setup cannot find dwtrig20.exe, find it in the setup folder and open it..then try installing it again.in most cases, the setup will not b able to find 2 files. open the two files whenever the setup cannot find them and then install.
this will surely work

This is a sign of a deeper issue. I have only seen this twice with thousands of office installs. This is a symptom of system file corruption. In my two cases SFC found corrupt files, but the real culprit were single bad sectors that would only be detected through HDTune's full system scan

Get another microsoft 2007 and reinstall the office.