Exact details of how to download and install Ding and Bob depends on the version of windows you are using. Please note that Ding will only work on a Windows PC / Laptop, it will not work on an Apple Mac, a tablet or a phone.
If you have Norton 360 installed, then it will stop you installing anything downloaded from the Internet that it doesn't recognise. To get around this, right-click on the Norton icon in the system tray (next to the clock in the bottom right of the screen) and select "Disable Auto-Protect". Then in the window which comes up, select to disable it for 15 minutes. This is long enough to download and install Ding and Bob. You don't need to do anything when you've finished - Norton will re-enable itself once the 15 minutes is up.
Generally installation in Windows XP is simple, just download and run the installer. If you are having any problems with this then it is probably due to security software you have installed, and how to resolve it will depend on the software installed. In most cases, it will just come up with a warning when you install or run the software, needing you to give it permission to continue.
Click on the download (as pointed at by the arrow) and it will run. You will probably then get a warning.
Click the "Run" button and the installer will start.
On the menu, select "Save target as". Note that the wording of this may be slightly different in different web browsers. This will bring up a box asking where to save it.
Select "Desktop" on the left hand side, and then click the "Save" button bottom right.
Now minimise the web browser, and you should find the install icon on the desktop. Right click on this, and on the menu which appears, click "Properties".
The properties box will appear.
At the bottom of the box, tick the "Unblock" tickbox. Then click OK to close the box.
Now double-click the icon on the desktop and the installer should start. You may get a warning appear asking if you want to allow it to make changes to your computer. Click "Yes".
This should be simple enough that you can do it without instructions, but just in case... Note that at any point in the process, you may get an extra popup appear asking if you want to make changes to your computer. If so, click "Yes".
Here is the first page.
Click "Next >" to get to the second page.
Click "Install" again.
Wait for it to finish.
Click "Finish". You should now find the Ding icon on your desktop. Double click it to run it.