Again, check with the Office specialists, but essentially, you can use your original program disc, if you have one, or go into the Control Panel/Add or Remove Programs. Among the issues would be what are called shared files--files which both versions use and need. I would think that uninstalling he '07 would not remove these, and that, in any case, you can repair the '10 version with the discs if problems come up. Experience, however, tells me to ask someone knowledgeable first, to avoid headahces and wasted time.