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, I will help you.
The date and time are correct.
Our desktop is windows xp. We have DSL and a wireless router.
Thanks for your information.
Follow the link : : : http://www.pctools.com/threatfire/answers/id/760/ to uninstall Threatfire, then download mcafee
Get back to us, if you still face any other issue with the download.