What do you mean you don't know if it's the right one or not? How confusing can it get?

How did you install IIS, and what OS are you running?

Here's a checklist for Error 1720:

Installing ComponentOne Controls requires the following:

* Administrative Permissions
* Visual Studio .NET 2002 or 2003
* Windows Installer 2.0 (check the msiexec.exe file version for your version)
* IIS installed and running

Make sure that you have a copy of Visual Studio .NET installed on the target machine.

You may want to try disabling any antivirus software you have running, since this software may cause software installation failures.

MSI Installers have a known issue with mapped network drives. Copy the installer to the c:\root drive and try running the installation again.

If you are using the NTFS file system, make sure that the SYSTEM account has full rights over the target installation directory, the directory containing the installer file, and the Windows Installer directory, located at either c:\WINNT\Installer\ (WINNT 4 / Windows 2000) or c:\Windows\Installer\(Windows XP).

You must be logged in as an administrator of the target computer. You must also ensure that you have full permissions to install on the drive you have chosen. You must have Microsoft Windows Installer version 2.0 or greater to run the MSI package.

The MSI file may be corrupt. You may also want to try re-downloading the installation package and re-installing it.