In an inexplicable move, the Microsoft support forums have decided to add a "blacklist" of developments not accepted in Windows 10 to the CCleaner platform, an application that is responsible for optimizing the operating system. Developed by Piriform, the parent company Avast has its own anti-virus software, some users have reported that they have sometimes encountered issue in opening Avast on Windows. This post will introduce some methods.

Microsoft Banned CCleaner?

There are many clean software for Windows users, while the CCleaner is the first choice for many Windows users when it comes to cleaning the hard disk. People who have been using Windows for many years have known that in the past, one of the actions to "remediate" and optimize certain tasks was to go to the operating system registry and get down to earth. Despite being a very sensitive area, the function was very popular, although always poorly viewed. In that sense, Microsoft has never been a fan of tools that touted a registry cleaning service.

Now it looks like the company has hardened its position and CCleaner is blacklisted.

A few months ago it was announced that CCleaner caused some compatibility issues with Windows Update. Also, one of the reasons could be that CCleaner was installed on some computers by a bug that had not been fixed so far, or because of malware in Windows updates. The exact reason why Microsoft blacklisted CCleaner is still unknown, and until the company is justified, we will never be sure.

Avast Antivirus Not Opening on Windows?

CCleaner's parent company - Avast, owns a popular antivirus software - Avast Antivirus, which is a very common antivirus option that provides solid protection against viruses for free, but you can also use a paid version. The utility is not blacklised by Microsoft, but there are a lot of different problems surrounding it as well. One of the most common problems is Avast not opening on Windows with no error messages.

Reasons for Avast Not Opening on Windows

Avast may not open because of many different problems. This part will show you the most common reasons that affect most users. You need to determine the correct reason to find the best solution for this issue and solve the problem as soon as possible.

Broken Avast Installation
Avast Antivirus Service Not Running Properly
If you want to know how to fix Avast not opening on Windows issue, the easiest way is to restart the Avast Antivirus service, if that doesn't help, check out other methods.

Method 1: Repair Avast

If Avast installation is having problems, for example, it won't open at all, the best way is to fix the Avast installation by finding the Control Panel and then following the repair wizard. This solution works for a lot of people but considering that you may need to readjust some settings, you may have changed them in your antivirus.

Step 1: First, make sure you log in with an administrator account because you won't be able to use any other accounts to delete the program.

Step 2: Type control panel in the search bar and click Control Panel to open it.

Step 3: In Control Panel, select View by: Category and click Uninstall a program under the Programs section.

Method 3: Perform a Clean Install

Performing a clean install can fix almost everything including the Avast not opening on Windows issue. It is very simple for you to perform a clean install. If all methods mentioned above fail to fix this issue, you can try this method right now.

Not only does it perform the regular uninstall, it also removes the cache file and any related registry entries that may have been corrupted.

You can follow the steps below to execute a clean install.

Step 1: Get into the download page of Avast, click the FREE DOWNLOAD FOR PC button to download the latest version of the Avast installation.

Step 2: Get into the uninstallation page of Avast, download the uninstallation utility – avastclear and save it to your computer.

Step 3: After downloading these files and booting into Safe Mode, disconnect from the Internet.

Step 4: Press the Windows key + R key at the same time to open the Run dialog box. Type msconfig in the dialog box and then click OK to open the System Configuration window.

Step 5: Switch to the Boot tab, check the Safe boot option and then click OK.

Step 6: Restart the computer in order to boot into Safe Mode.

Step 7: Run the uninstallation utility of Avast and browse the folder where Avast is installed. If Avast is installed in the default folder - Program Files, you can keep it. Browse through File Explorer until you find the correct folder.

Step 8: Click Remove and then restart the computer with the normal startup.

Right now, you can check to see if Avast not opening on Windows issue is fixed.

To Better Protect Your Computer

Since Avast is a quite powerful antivirus software, how do you protect your computer if it can’t work properly? Your computer will be in danger and your computer may even be attacked by viruses without the protection of Avast, which will eventually cause the computer crash.

Thus, it is vital for you to find a way to protect your computer. A piece of free backup software - MiniTool ShadowMaker is your best choice to back up your data ahead of time in case you lose data because of a virus attack.

To learn how to back up data with Backup function of MiniTool ShadowMaker, reading post Make a Backup with MiniTool ShadowMaker.

To sum up, this post has shown you some possible causes of the Avast not opening on Windows issue and also shown you how to fix this problem. In addition, it also recommends a piece of useful software - MiniTool ShadowMaker. In order to protect your data, you can back up your data with it.

A Quick Note about CCleaner Ban:

Microsoft has blacklisted the CCleaner utility, but that doesn't necessary mean users cannot downalod or use the tool, just links to the software can no longer be posted in Microsoft support forums. In exceptional cases, Moderators or Agents will still be able to insert pages belonging to the domain.

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