you might have another program or a virus running stopping the download?
Scroll to bottom toolbar
bottom of screen right mouse select task manager
applications you will
see whats running you might have a virus if you see anything you dont need
running select end now.
also under processes see
what is ticking over again if you see something you don't need to be
running end now
Avira Antivirus is an antivirus program that protects your
computer from infected files such as spyware, adware, viruses and trojans.
Avira is constantly updating its virus definitions and
regularly puts out new updates several times a day.
Avira comes with an automatic downloader, but it may not
work properly if the software is installed incorrectly or there is another
program conflicting with Avira.
Manually updating your Avira software takes a bit more time,
but it is as easy as clicking a few buttons.
Visit Avira's website and download the newest virus file definition.
Click "Download VDF" if you are using the most
newest version of Avira, or click "Download IVDF" if you are using an
older version of Avira.
Save the folder to the desired location on your computer.
Open Avira Antivirus.
Click "Update" and select "Manual
Find the downloaded VDF or IVDF folder on your computer.
Select it and click "Open".
Avira will now update itself with the newest definitions.
A status screen will alert you when the update is complete.
or you might have to download in safe mode
Restart your computer
repeatedly tapping the f8 key to enter safe mode while the screen is black once
in safe mode where the only things working will be your keyboard and mouse
allowing you to attempt to repair your computer
Windows Advanced Options Menu
Please select an option:
Safe Mode with Networking
Safe Mode with Command Prompt
Enable Boot Logging
Enable VGA mode
Last Known Good Configuration (your most recent settings that worked)
Directory Services Restore Mode (Windows domain controllers only)
Start Windows Normally
Return to OS Choices Menu
Use the up and down arrow keys to move the highlight
to your choice
Select safe mode with
networking to download.