Repairing Microsoft .NET Framework 3.5 to fix "NovaBACKUP Setup Wizard ended prematurely because of an error"

Last Updated: Nov 28, 2014 01:42PM PST
WARNING: The following commands alter components of your Windows installation that may be critical to software not related to NovaBACKUP. While these commands are provided from Microsoft themselves, it is possible that following these instructions could result in unexpected / unwanted system errors, proceed at your own risk.


We have seen a number of cases where NovaBACKUP will fail to install and issue the error:


NovaBACKUP Setup Wizard ended prematurely because of an error.
Your system has not been modified. To install this program at a later time, run the Setup Wizard again. Click the finish button to exit the Setup Wizard.


We have identified one potential root cause for this can come from a corrupted or improperly configured Microsoft .NET 3.5 framework. Follow the instructions below to repair Microsoft .NET 3.5:

Run a Command Prompt as Administrator:

Click Start -> All Programs -> Accessories

Right Click "Command Prompt" and click "Run as Administrator"


NOTE: The following commands are case sensitive, run each of these lines of commands in succession one after the other, wait for each to complete before proceeding to the next command:

DISM /online /disable-feature /FeatureName:NetFx3

DISM /Online /cleanup-image /RestoreHealth

DISM /online /enable-feature /FeatureName:NetFx3


The first and third commands will uninstall / reinstall .NET 3.5 respectively. The second command (DISM /Online /cleanup-image /RestoreHealth) will take some time (anywhere from 10-20 minutes, depending on your system and the number of errors found).


Once you have run these commands and successfully reinstalled .NET 3.5, please attempt to install NovaBACKUP again.

If the above steps do not work for you, it could be due to the Operating System that you are using, these steps will be very similar but will be divided in to the different Operating Systems to show you similar method of repairing / removing .NET / re-installing .NET by Operating System type.  Follow this guide:

Follow the Guide here:

Alternate Steps:

If You Still Have Issue:

Run .NET Repair:

Microsoft .NET Framework Repair Tool

If You Still Have Issue:

Please run the System File Checker with these steps: 

1. Click the Start orb and then type cmd in the Search programs and files field. 

2. In the results area, right-click cmd.exe, and then click Run as administrator. You will be prompted to type the password for an administrator account. Click Continue if you are the administrator or type the administrator password. Then, click Continue.

At the command prompt, type sfc /scannow, and then press ENTER.

The scan may take some time, so be patient. Windows will repair any corrupted or missing files that it finds

If that Does Not Help:

You can Diagnose and fix program installing and uninstalling problems using This Microsoft Utility:

If None of those steps Helped:

Uninstall .NET 3.51

To Uninstall .NET you need to go to Control Panel, go to Programs and select Turn Windows  Features on or off and Uncheck Microsoft .NET Framework 3.5.1

Then Restart Computer

Go Back to Control Panel, go to Programs and select Turn Windows  Features on or off and Check Microsoft .NET Framework 3.5.1, Then Restart Computer

And install NovaBackup

Microsoft .NET Framework 3.5 Service Pack 1 (Full Package) here:
Supported Operating Systems
Windows Server 2003, Windows Server 2008, Windows Vista, Windows XP

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