After the 2014-01-18 patch, started failing to start.
It would show "Checking for updates...", then "Updating Agent..", and finally fail saying: "Installation: Something went wrong while trying to launch a program. If it happens again, try restarting your computer." After hitting the close button, there are several processes that continue to run, consuming lots of processor.
If you don't have the installation discs, please refer to the alternate installations methods.
Blizzard also offers it's customers to download and install the entire game through the Blizzard Downloader.
This is usually caused by issues with the graphics card driver, visit binary drivers for more information.
If you have the installation discs, this guide recommends that you copy the contents of your discs to your hard disk and install Wo W from there.
There is a way to get around this particular feature though, which you’ll find in our How to Stop Windows 10 updates guide.
But if you find your PC sitting at a certain percentage value indefinitely, then Windows Update is probably stuck in a loop.
Change DNS server settings It is highly suggested that you keep your device drivers up-to-date, just to avoid any unwanted errors in your PC.
To keep them updated, you can download them online and then install them one by one.
Please check your internet connection and try again.
BLZBNTBTS0000004AThis error is usually caused by an unstable internet connection or a third-party program that is blocking access. If you're using a wireless connection, optimize your internet connection to rule out a connection issue.
This may take some time, even when using a fast connection.