[relroy]

I have windows 2000 and internet explorer with default settings.I have installed shock wave and flash player and don't have any problems with majority of the websites.but when I tried to register online for an exam,this site:
http://securereg3.prometric.com/PolicyAgreement.aspx didn't open .the same thing happened when I tried to play an online game at this address: www.zapak.com/gameplay.z?gid=32&gnrid=5. I got the same response shown below:-

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The page cannot be displayed
The page you are looking for is currently unavailable. The Web site might be experiencing technical difficulties, or you may need to adjust your browser settings.

Please try the following:

Click the Refresh button, or try again later.

If you typed the page address in the Address bar, make sure that it is spelled correctly.

To check your connection settings, click the Tools menu, and then click Internet Options. On the Connections tab, click Settings. The settings should match those provided by your local area network (LAN) administrator or Internet service provider (ISP).
If your Network Administrator has enabled it, Microsoft Windows can examine your network and automatically discover network connection settings.
If you would like Windows to try and discover them,
Click Detect Network Settings
Some sites require 128-bit connection security. Click the Help menu and then click About Internet Explorer to determine what strength security you have installed.
If you are trying to reach a secure site, make sure your Security settings can support it. Click the Tools menu, and then click Internet Options. On the Advanced tab, scroll to the Security section and check settings for SSL 2.0, SSL 3.0, TLS 1.0, PCT 1.0.
Click the Back button to try another link.

Cannot find server or DNS Error
Internet Explorer

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Where exactly is the problem?please suggest any change in settings or downloading any certificate or software which might solve this problem.I also thought of downloading Firefox.would that help?

[RickJ]

You asked about this here.

If you've cleared your cookies and temp files and still can't log in, then contact the website people for help.

[relroy]

I can open it from other computers.there is no problem with the websites.I want to know any changes in browser settings because that seems to be the problem