Microsoft apparently isn’t keen on you installing CCleaner on Windows 10 any more. Bleeping Computer (opens in new tab) spotted that the software is now flagged to users attempting to install it as “potentially unwanted software” by Windows 10’s built-in antivirus software, Windows Defender.
“Potentially unwanted software” -- sometimes known as “potentially unwanted apps” or PUAs -- aren’t flagged as malware or malicious. But they are potentially annoying.
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Microsoft’s explanation (opens in new tab) seems to back this up.
“Certain installers for free and 14-day trial versions of CCleaner come with bundled applications, including applications that are not required by CCleaner or produced by the same publisher Piriform,” the company writes.
“While the bundled applications themselves are legitimate, bundling of software, especially products from other providers, can result in unexpected software activity that can negatively impact user experiences.”
The bundled applications are Google Chrome, Google Toolbar, Avast Free Antivirus and AVG Antivirus Free. Avast owns AVG as well as CCleaner publisher Piriform.
“While the bundled applications themselves are legitimate, bundling of software, especially products from other providers, can result in unexpected software activity that can negatively impact user experiences,” Microsoft concludes, justifying the flag.
This certainly won’t help software which is still struggling from past reputational damage. A Google search just now suggested a number of questions in the “People also ask” section which the company won’t exactly be thrilled with:
The malware and “infected” questions relate to a malicious version of CCleaner released in 2017 where hackers managed to insert code to steal data from users. It was also rumoured back in 2019 that Microsoft planned to include links to the site on a block list on its own community forums (opens in new tab), for fear that enthusiastic amateurs could do more harm than good with the power of a Registry cleaner.
Still, the firm is confident that this latest issue with Windows 10 will prove to be short lived.
“We are in the process of engaging with Microsoft to understand why CCleaner was recently detected as PUA,” a CCleaner spokesperson told TechRadar (opens in new tab). “We surmise the issue appears to be around bundling, and we believe we have addressed this so that our product is now no longer flagged.”