Check the date and time, if it is not correct, correct it and restart the computer
What is the type of Operating system ? ( Windows XP / Windows VISTA / Windows 7 )
What is the type of internet connection ? ( DSL / Dial-up / Cable / Wireless / Satellite )
Get back to us with the above details.
May i know at which step the installation crashes , Is it when you click on the Download button on the website or when you execute the DM set up ?
Also provide us some information about the operating system of the computer , Was it an upgrade from vista or a brande new one ?