Hello, WeebTuku
Welcome to the Microsoft Community.
Hello, thanks for chiming in with your issue, it sounds like you are experiencing an inability to click on the trackpad, mouse, or even left alt+left shift+num to lock the mouse button while using your Lenovo ThinkBook.
Here are some steps you can try in order to troubleshoot this issue:
- Check background applications
Sometimes background applications can interfere with mouse functions. Try closing unnecessary applications and see if that solves the problem.
- Update the touchpad driver
Even if Windows indicates that the driver is up to date, a reinstallation may still work:
Go to the Lenovo Support website and download the latest touchpad driver for your model.
Uninstall the current driver in Device Manager (under “Mice and Other Pointer Devices”) and then install the downloaded driver.
- Check the touchpad settings
Make sure the touchpad settings are configured correctly:
Go to Settings > Devices > Touchpad and check the settings.
Ensure that the touchpad is enabled and look for settings that may affect the click function.
- Disable Tablet Mode
If your laptop has a tablet mode, make sure it is disabled:
Check that Tablet Mode is on by swiping inward from the right edge of the screen to open the Action Center. If it is on, turn it off.
- Run the mouse troubleshooting tool
Windows has a built-in troubleshooting tool that may help:
Go to Settings > Update & Security > Troubleshooting > Other Troubleshooting > Hardware & Devices and run the troubleshooter.
- Check for Windows updates
Make sure your Windows system is fully up to date:
Go to Settings > Update & Security > Windows Update and check for updates.
- Perform a clean boot
Clean Start can help identify if there are background programs causing problems:
Press Windows + R, type msconfig, and press Enter.
In the System Configuration window, go to the Services tab, check “Hide all Microsoft services”, and then click “Disable all”.
Next, go to the Startup tab and click Open Task Manager. Disable all startup items.
Restart your laptop and see if the problem persists.
How to perform a clean boot in Windows - Microsoft Support
Disclaimer: A “clean boot” starts Windows with a minimal set of drivers and startup programs. It helps to determine whether a background service is interfering with your game or program and to isolate the cause of a problem.
These steps of "clean boot" might look complicated at first glance. However, to avoid any trouble for you, please follow them in order and step-by step so that it will help you get back on track.
- Check Accessibility Options
Make sure that sticky keys or similar accessibility features are not interfering:
Go to Settings > Accessibility > Keyboard and check the settings.
- Scan for malware
Malware can cause unusual behavior. Perform a full scan with Windows Defender or another trusted antivirus program.
You can try it out by referring to the steps above, and after that, give some feedback and I will further support you.
Best regards
Bobhe | Microsoft Community Support Specialist