Does Your Word 2007 Crash and You Can’t Use Mouse?

I just experience this problem recently where Word 2007 running on Vista Ultimate kept crashing. I was able to start it but couldn't use the mouse (e.g. couldn't highlight words or right-click). On closing Word it will crash with the following error: Problem signature: Problem Event Name: APPCRASH Application Name: WINWORD.EXE Application Version: 12.0.4518.1014 Application Timestamp: 45428028 Fault Module Name: mso.dll Fault Module Version: 12.0.6017.5000 Fault Module Timestamp: 461db01f Exception Code: c0000005 Exception Offset: 00039239 OS Version: 6.0.6000.2.0.0.256.1 Locale ID: 1033 Additional information about the problem: LCID: 1033 Brand: Office12Crash skulcid: 1033 Read our privacy statement: http://go.microsoft.com/fwlink/?linkid=50163&clcid=0x0409 I tried the Office Diagnostic but that didn't help. Then I used System Restore but that didn't solve the problem either. I started Word in safe mode (winword /a) and that worked. As a temporary workaround, I created a shortcut that runs Word 2007 with /a switch (safe mode) until I figure out exactly what's causing the problem.