Sometimes during the Salesforce for Outlook installation the wizard disappears and installation fails. This is most probably caused by Anti Vitus or other security programs installed on the user's computer. To resolve this issue you need to have local administrator permission on the computer (Note: This is different from the Salesforce Administrator) to be able to stop the security software (such as Norton 360, AVG, ESET Smart Security, etc).

1. First of all you would need to close Microsoft Outlook and all the browsers.
2. Then you need to stop the security software temporarily.
   • Make sure to re-enable the security software after your Installation is done.
   • Also it's best if you can download the Salesforce for Outlook setup file to your Desktop or another folder in your computer before stopping this process.
3. The stops to disable the security software vary and you may need to check with the software manufacturer.
   • You can try stopping it from the Services and start up tab but it may not work with certain security applications.  To try this:
     1. Windows Vista/7: Click on Start and type In msconfig into the search box and press Enter
     2. Windows XP: Click on Start | Run and type in msconfig and click on Ok. 
4. The System Configuration Utility will launch.
5. Click on the Services tab and uncheck the process representing the security software (such as AVG, ZoneAlarm, etc) and then click Ok.

Windows Vista/7 Only Users
Since Windows Vista and 7 have the built-in security setting called UAC (User Account Control) which Is enabled by default, make sure to run the Salesforce for Outlook setup file as Administrator (right click on the setup file and click on Run as Administrator) to make sure the setup installs the application correctly.  You may also need to run the Salesforce for Outlook application as an administrator as well.  To do this:

• Simply right click on the Salesforce for Outlook shortcut
• Click on Properties
• Click on the Compatibility tab
• Under Privilege Lever check the box for Run as Administrator.

1. Close Salesforce for Outlook (SFO) from the system tray if its installed already but not working.
2. Close Microsoft Outlook
3. From Control Panel/AII Control Panel Items/Programs and Featuresuninstall the following 2 applications:
   1. Salesforce for Outlook
   2. If you have Microsoft Office 2010, uninstall the Microsoft Office 2010 Primary Interop Assemblies or if you have Microsoft Office 2007, uninstall the Microsoft Office 2007 Primary Interop Assemblies.
4. Close the Control Panel
5. Navigate to C:\Users\<user name>\AppData\Roaming\salesforce.com\Salesforce for Outlook\
6. Delete the Install folder
7. Run SFO as Administrator (right click on the setup file and click on Run as System Administrator).
8. On the installation prerequisites step (as you see below) make sure you check the boxes for items below and click on Next.
   1. .NET framework 2.0
   2. Office 2010 PIA
   3. VSTO 2005 SE Runtime
9. If you have windows Vista or 7, you may see a couple of pop-ups (similar to the one below) prompting you that such application might not have installed correctly, and ask you to either reinstall with the recommended settings or select this program installed correctly. Make sure to select the first option to reinstall the app.
10. On the last step, make sure to uncheck the box for Launch Salesforce for Outlook and then select Finish.
11. Then locate the SFO shortcut on the Desktop.
12. Right click on it and click on Properties.
13. Click on the Compatibility tab.
14. Check the box tor Run as System Administrator and click Ok. 
15. Run the plug-in by double clicking on the shortcut.
16. Start Microsoft Outlook
17. Now you need to configure the SFO by right clicking the system tray icon and select Settings and type in your username and password and select your sync folders.
18. After you finish the configuration the Sync process will automatically starts.