On this very computer I used to be able to play Invade Earth. I am able to download and access this game on friends computers but have been unable to so on mine. I am not adept enough to solve this nor know what it means...can anyone help?

On multiple times I have tried and receive this error:

Comcast.net

Comcast

Welcome to Comcast High Speed Internet, The fast and easy way to get online

This installation process will take just a few minutes to complete. You will be required to provide your
account information to complete registration.

New Customers

You will need to activate your account and create your Comcast.net email address and
password. To continue, please follow the installation instructions.

Installation Instructions

Click the "Download" button below to download the Comcast installation software and begin the
installation process for new customers.

Note: Please temporarily disable any firewall, anti-virus and pop-up
blocking software currently running on your computer before running the installation software

Existing Customers

If you have a Comcast.net email address and password, please follow the installation
instructions.

Installation Instructions

Click the "Download" button below to download the Comcast installation software and begin the
installation process for existing customers.

Note: Please temporarily disable any firewall, anti-virus and pop-up
blocking software currently running on your computer before running the installation software

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• © var now = new Date; document.write(now.getFullYear()); Comcast Cable
  Communications, LLC. All rights reserved.

if ((navigator.appVersion.indexOf("Win") == -1) && (navigator.appVersion.indexOf("Mac") == -1)) {
document.getElementById("content").innerHTML = "Your operating system is not supported by Comcast's Installation Wizard. Please call 1-800-COMCAST to setup your account.";
}

if (navigator.appVersion.indexOf("Mac") != -1) {
downloadFile = "ComcastInstallWizard.dmg";
}
else {
downloadFile = "downloadable_install_wizard.exe";
}

document.getElementById("button-container").innerHTML = "";