Question : object library invalid contains references to object definitions that could not be found

I deleted trial version of Excel Office Professional Trial Version and installed new Office Home and Student 2007. Whenever I try to open excel 2007 I get the above error message.  I read answers in data base but couldn't understand what to do.  Do not have VBA on machine and couldn't find any .exd files.  

Answer : object library invalid contains references to object definitions that could not be found

If you don't need them, then you should be able to remove them from the add-ins list. It would appear that one or other of them has a reference that is broken, but unless you have access to the code, there won't be much you can do about that, I don't think.