How to install

I downloaded the latest version from internet security suite and i recieved two files; one named “CIS_Setup_3.8.64739.471_XP_VISTA_X64” and one named “Comodo Error” from 38kb.I run Vista x64, so i installed the first file. The result was that i could’nt go anymore on the internet with any program except “windows mail”. The diagnostic tool sayd everything was ok.Searching, i discovered by the dive-manager on the “Networkadapters” a device “Microsoft 6to4 Adapter” with a failor indication. I removded dy going back to a restore point and everything was back normal. I’am no specialist, so i need help to solve this problem.
I hope someone can help me with good advice.
Thanks already.