I bought my acer laptop 5 years ago. Before upgrading from Windows 7 to Windows 10, I would not install any software in this laptop from my testing experience. This is the best way to prevent any software incompatibility. If I have a lot of software installed, it takes a long time to finish the upgrade. That’s not what I want.
I downloaded the Media Creation Tool to install Windows 10. It was easy and fast.
After the installation, I noticed the performance in acer laptop was really bad. When using Microsoft Edge to open Internet Explorer or using Chrome to search online, the laptop was in the heavy load, which caused DPC_WATCHDOG_VIOLATION screen all the time.
One day later, I decided to downgrade to Windows 7. It has “Go Back to Windows 7” feature. After the downgrade, the performance is really FAST and one issue happened:
The language bar was missing in the taskbar even if my keyboard setup looked good in Regional and Language. I couldn't switch to Chinese language via Ctrl+ Space. Ctrl+ Space has been used for more than 10 years before Windows 8 was released. In Windows 10 & Windows 8, we need to use Win Key+ Space. I believe it is the downgrade bug. I finally found a way to make it work.
Go to the registry key : HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Right Click to create a new String Value on the right side.
Enter the value: ctfmon=CTFMON.EXE
Reboot the laptop. I can see the language bar in Windows 7 again
If you have the old laptop, upgrading to Windows 10 is not a good idea.