Hi, I'm Estrella. I'll do my best to help you.
The update may have caused a driver conflict or disabled the touchpad driver, which is why it is not working properly. The KB5060829 Cumulative Update Preview is an optional update.
Have you already tried to download and install the touchpad driver from your PC manufacturers website?
If you need help, What is the make and model of your device?
In the search bar, type MSINFO32 and hit Enter.
Please share a screenshot of that window.
When you said you’ve done everything in Device Manager, did you already try uninstalling the touchpad driver and then restarting your computer to let it reinstall automatically? Have you also tried disabling and re-enabling it, or rolling back the driver to a previous version?
Have you also tried uninstalling the Windows Update that may be causing the issue?