From an individual user’s computer: 

If you use Internet explorer you can follow the steps below to be automatically logged in to SharePoint:

Navigate to the home page of the SharePoint site

Add your SharePoint site as a trusted site:

To do this (with in Internet Explorer 7.0 and Internet Explorer 8.0)

- Click on Tools on the menu bar

- Select Internet Options

- Click on the Security Tab

- Select Trusted Sites (Green Checkmark)

- Click on the  sites button

- Add the URL for the SharePoint Site

- Close the Trusted Sites dialog box

- Then click Custom Level

- Scroll all the way down

- Under User Authentication ->logon

- Select Automatic logon with current user name and password

- Click OK

- Click OK

If you are a Domain Administrator:

You probably want to apply these settings to all of your users. This can be done by using Active Directory Group Policies.

On Windows Server 2003, without the Group Policy Management  Console:

1. Login to your domain controller.

2.  Go to CONTROL PANEL > ADD OR REMOVE PROGRAMS > ADD/REMOVE WINDOWS COMPONENTS > INTERNET EXPLORER ENHANCED SECURITY CONFIGURATION.

3.  Uncheck the Internet Explorer Enhanced Security Configuration option, and click Next until the wizard completes. This option can be re-enabled at step 10, if you want or if your corporate policy requires it.

4.  Go to START > ALL PROGRAMS > ADMINISTRATIVE TOOLS > ACTIVE DIRECTORY USERS AND COMPUTERS.

5.  Right-click your domain name (or whichever Organizational Unit contains the users to which you wish to apply this fix), and choose Properties.

6.  Click the ‘Group Policy’ tab, and then the New button. Type in a descriptive name for the New Group Policy Object that appears.

Make sure that your new policy is selected and click the Edit button.

7.  Drill down to USER CONFIGURATION > WINDOWS SETTINGS > INTERNET EXPLORER MAINTENANCE > SECURITY > SECURITY ZONES AND CONTENT RATINGS.

8.  When you click the button labeled ‘Import the current security zones and privacy settings’, you will likely receive a warning about ‘Internet Explorer Enhanced Security Configuration’.

This is why we disabled the enhanced configuration in step 3, so that this policy would apply to normal workstations. Click Continue.

9.  Close all open windows.

10.  You can now go back to the ‘Add/Remove Windows Components’ box and re-enable the Internet Explorer Enhanced Security Configuration if you wish.

If you have the Group Policy Management Console or are using Windows Server 2008:

To be continued....