office 2007 slow performance reasons?

Last month I was facing the same problem with office 2007. When I launch it and works for some time it hangs up and some time it restart by itself. It really creates lots of problem for me. So for solving the problem I have taken the advice from the professionals. They told me that either your Office 2007 software is corrupted or it is happening due to some virus problem. So for that they recommend me that first of all install a new full version antivirus. After that perform the full system scan. Now Uninstall your office 2007 completely and reinstall it again. Now restart your system again check if it is working smoothly. I repeated the whole process and now my office 2007 is working very fine. So you can repeat the same process and check if your office 2007 resume its normal working.