To run the TopRank 1.5 for Excel installer, you must have write access to your WINDOWS directory and your WINDOWS\SYSTEM directory. You must also have read, write, delete, and execute access to your TEMP directory. If you do not have this access, contact your system administrator. Write access to the WINDOWS and SYSTEM directories is only needed during installation, not while running TopRank 1.5 itself. You must have read, write, and delete access to your system registry to install TopRank 1.5. The TopRank installer creates several registry keys, to which TopRank must have read, write, and delete access at run time. These privileges are set up automatically during installation, but if you later change your registry's privileges, you may need to reinstall TopRank.