I got a email yesterday about this strange behavior on certain machines trying to access SharePoint and got a Javascript error message as below.

After searching the web the top 2 result shows that this is not a isolated case. From this MSDN Forum response, its seems that the client machine’s Office installation has problem and the user need to do a installation repair. To do this, go to Add & Remove program in Control Panel, click on Office and choose the Repair option.

I remember reading a Javascript code from my SharePoint installation that there is a checking of the client Office installation and it’s version. So it’s just my judgement that I suspect this part of the Javascript code couldn’t access the Office’s DLL files and thus return the error.