1.  Uninstall the incorrect version of the software.
2.  Download and install the correct software.

Uninstall the Wrong Software
You don't need to do this if you actually want both softwares installed. However if you want to get rid of the other software:

To uninstall:

Ensure Microsoft Outlook and Microsoft Word is closed. Press Ctrl+Shift+Esc to open Task Manager. Click on the Processes Tab.
End processes with the names OUTLOOK.EXE and WINWORD.EXE
Go to Start -> Control Panel -> Add or Remove Programs
Select the incorrect version of the software and click Remove.

Use the appropriate link below to download:

Link to download QuickFile Standard Edition: (Outlook 2000, 2002/XP, 2003, 2007)http://www.standss.com/quickfile/files/quickfile.exe

Link to download QuickFile Professional Edition: (Outlook 2000, 2002/XP, 2003, 2007)http://www.standss.com/quickfile/files/quickfilePRO.exe

After downloading, install and register QuickFile:

To install and register:

1. Ensure Microsoft Outlook and Microsoft Word is closed. Press Ctrl+Shift+Esc to open Task Manager.
Click on the Processes Tab.
End processes with the names OUTLOOK.EXE and WINWORD.EXE
Double click on the downloaded file to start installation.

Follow on screen instructions to install QuickFile.

2. Open MS Outlook. The Register QuickFile screen will show up.

3. Select the register tab on this screen. Enter the Registered Name and Unlock code exactly as you received and click OK.

You will now have a fully functional version of QuickFile.