I am facing these problem when trying to install McAfee LiveSafe to different computers.
1. Trying to install McAfee LiveSafe in a clean Windows XP SP3 platform but was prompt the software is not supported in the current operating system.
2. Trying to install McAfee LiveSafe prompt Problem Cleaning Threats and follow by Download Cannot Continue due to Internet Problem. Although there is no problem with the internet connection.
I think there might be some viruses or spyware that edit the OS by treating the system as offline connection although I have tried scanning with McAfee RootkitRemove, Stinger, Getsusp with no infection or error.
Virtual Technician also does not help in both problems although 1 system cannot even install due to fake internet problem also.
Message was edited by: yjtan on 12/11/13 3:38:24 AM CST
It may be detecting remants of another anitvirus perhaps? If there were any installed to your knowledge check for removal tools to get all the last remnants of it out of the system.
You could also try running Malwarebytes Free, linked in my signature blow, last line under 3rd Party Tools.