If you are using workstation security or if you have a firewall in place, this could be "blocking" you from placing an order. There is a method for checking out without the firewall. At the shopping cart /order screen, at the bottom of the page, after the check out button, you will see the following:

If your browser returns an error when you click the Check Out button, it could be because you are behind a firewall or proxy server which prevents secure connections. Check this box and click the Check Out button again to checkout using a non-secure connection. Checking the box will only apply to the Digital Dissertation website, and will in no way affect the security settings of any other website.

If you are using personal firewall software, you may have problems authenticating into an account due to this blocking information that is used to login.

If Using Norton Internet Security 2005:

1. Open Norton Internet Security 2005.
2. Click on privacy control.
3. Click on configure.
4. Click on advanced.
5. Click on add site.
6. Enter in umi.com.
7. Click on ok.
8. Click on umi.com in the panel on the left.
9. On the right, uncheck all the boxes under the Global settings tab.
10. Choose permit for all the radio buttons.
11. Under the User Settings tab, uncheck all the boxes.
12. Choose permit for all the radio buttons.
13. Click ok and log back into ProQuest via your libraries site.

If Using Norton Internet Security 2004

1. Open Norton Internet Security 2004.
2. In Norton Internet Security 2004, double-click Privacy Control, and then click Advanced.
3. Click Add Site. A new site/domain box appears.
4. Enter the name of the site that you want to receive the referrer information and click OK. In this example, it will be umi.com. The site name appears in the left frame of the Options window.
5. Click the name of the new site.
6. Click the Global Settings tab.
7. In the "Information about visited sites" section, clear "Use default settings."
8. Click Permit.
9. Click OK to close the Options window.

If Using Norton Internet Security 2003

1. Open Norton Internet Security 2003.
2.  In Norton Internet Security 2003, click Options > Internet Security or Personal Firewall (This step is not always needed), and then click the Web Content tab.
3. Click Add Site. A new site/domain box appears.
4. Enter the name of the site that you want to receive the referrer information and click OK. In this example, it will be umi.com. The site name appears in the left frame of the Options window.
5. Click the name of the new site.
6. Click the Global Settings tab.
7. In the "Information about visited sites" section, clear "Use default settings."
8. Click Permit.
9. Click OK to close the Options window.

If using Norton Internet Security 2002:

Open Norton Internet Security 2002.
1. Click Options at the top of the screen.
2. Click Advanced Options at the bottom of the screen.
3. Click Add Site at the bottom of the screen.
4. Enter the domain name umi.com.
5. Click OK.
6. Click on umi.com in the window on the left side of the window.
7. Click the Privacy tab.
8. Change cookies to permit.
9. Change email to permit.
10.Click Active Content Tab.
11.Change all pull down menus in this window to Allow.