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But I'm not sure that's what you need here. There is something missing that is preventing whatever it is from starting and that needs to be replaced.

It could be something as simple as reinstalling the Program which will allow all the remainder to work or it could require a Repair following the steps here and your M$ Branded Install Disc:-

http://support.microsoft.com/kb/292175

If you are getting this error message before Windows Opens you have to follow the directions in the M$ Knowledge Base Article but if Windows is opening just reinstalling FF may cure the problem.

Col

This path given in the error, is this to be interpreted literally or is it something you typed in and may contain typos? Specifically, a couple of issues off the bat are this, 'C\Wbemjc\program files/'
1.) There is no colon following the C
2.) The / at the end of Program Files should be \
3.) Now this is the one that puzzles the most. A quick search of WBemjc with google reveals a single page with that string. And other than the results relating to this particular post of yours, there is only one real hit. That hit has nothing to do with a software company. To be quite sure, there is usually nothing in front of C:\Program Files\. Can you repost the exact error message you are getting? Would go a long way in troubleshooting this issue.

If you look, is it there? If so, try registering the dll. If not, pull a copy off the installation media and drop it in the directory.