If you see this:

Click OK and continue to insert the username and password

On Older computers Win98 you may be asked to download and accept an activeX component you need to answer yes to any pop up or certificates.

Why am I unable to view the live video of my Internet camera in Internet Explorer after upgrading to Service Pack 2? Windows XP Service Pack 2 increases the security in Internet Explorer. You must "allow" the plug-in before you can view the live video of your Internet camera.
Step 1 Open a web browser and type the IP address of your Internet camera in the address bar. Press Enter.
Step 2Click OK if Failed to connect appears. Enter your username and password and click OK (if applicable).
Step 3 At the top click This site might require the following ActiveX Control: ´Name of ActiveX control here´ from ´D-Link Corporation´. Click here to install....

Step 4 Click Install ActiveX Control....

Step 5 In the Security Warning window click Install.

The live video will now be streamed.

Which web browsers will allow me to view the video from

Internet Explorer 5.x or higher running on a computer with Windows 98, ME, 2000 or XP is the only web-browser which will properly support the MPEG-4 plug-in required for viewing the video from

All other browsers (including handheld computer browsers and Internet Explorer for Mac) will not be able to view the video.

How do I view streaming video using Internet Explorer 5.1 for Macintosh?

Unfortunately, at this time, the plug-in we provide for MPEG4 Short Header Mode only supports Internet Explorer in Windows. You will still be able to configure the camera with a Macintosh but you will not be able to view the video.

What is Active X

A technology developed by Microsoft for sharing information among different applications, ActiveX supports new features that enable it to take advantage of the Internet. For example, an ActiveX control can be automatically downloaded and executed by a Web browser. ActiveX is not a programming language, but rather a set of rules for how applications should share information. It allows you to create cross-platform, language-independent controls.