Windows 11 has less than a week between us, but from day one it was running into various problems. Cases like that of the memory leak in File Explorer or wrong taskbar with an unresponsive Start Menu, they have been under investigation by Microsoft for several days.

However, they are not the only ones to date, and the most recent has to do with blocking the update on computers that use certain applications, specifically, those that create registry keys using non-ASCII characters. That is, any character outside of the letters, numbers, symbols, and punctuation marks that can be found on a standard English keyboard.


Microsoft explains that they have discovered compatibility problems in apps that use this type of characters in their registry keys or subkeys, and that they may be unable to open or even cause other problems in Windows, including blue screenshots.

That is why the company has decided to block the update to prevent Windows 11 from being offered to affected devices. They also recommend not attempting to update manually using the button in Windows Update or using the Media Creation Tool, until a solution is available.

And a couple of problems with AMD processors

Windows 11 Problems

AMD and Microsoft are also investigating processor compatibility issues. They have determined that some supported CPUs may experience a reduced performance in some applications within Windows 11.

In addition to this, AMD processors are also experiencing an unexpected slowdown in Windows 11 caused by UEFI CPPC2 (preferred core) that does not schedule threads on the faster processor core.

The impact can reach between 3 and 5% in some applications, but in the case of some eSports video games the performance drop can be up to 15%

This decrease in performance is most noticeable in applications sensitive to the performance of one or a few threads of the CPU and can be seen more in CPUs with more than 8 cores above 65W TDP.

Microsoft and AMD are working on updates to fix performance issues, but for now the estimated release date is late October, so they recommend as a “workaround” keep using a supported version of Windows 10 until Microsoft offers an update.

That would also be our recommendation, not to update to Windows 11 at least for now, because it really is not necessary.

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