According to the information that you provided, it seems that your overheating issue is happening only when running Microsoft* Office 2007, since when running the Internet browser, you are not having the overheating issue.
Anyways, I would suggest installing the latest BIOS version for your motherboard, and make sure that the processor fan/heatsink is properly installed, try removing and reinstalling it.
If the same issue continues, then please test this processor on a 2nd known working and compatible motherboard to see if it causes the same behavior.
Well, if I had a PC parts store or was a san of Bill Gates I whould defenatly test it on the second compatible motherboard.
However just to be on the safe side I bought and installed Noctua CH-14 processor cooling fan. For now the temperature is always arround ~30 c.
Thank you for your support