According to your description, if the system is stuck and the memory utilization rate is high, it may be caused by drivers, viruses, software conflicts and system problems;

1, I suggest you update the antivirus software patch to completely kill virus.

2.Ctrl+Alt+Del, open the process box in the task manager, and close the unimportant processes that occupy more CPU and memory resources.

3. It is suggested to close some startup items: Start-Run-msconfig, and cancel by removing some unimportant startup items or the "tick" in front of third-party software programs.

4. Drivers are recommended to be downloaded and installed in ASUS official website to avoid incompatibility of drivers updated by third-party software. The download page of this model driver in official website is as follows:/notebooks _ ultrabooks/ASUS _ vivobook _ s400ca/helpdesk _ download/

5. If two or more antivirus softwares are installed in the system, the system will start slowly. It is recommended to keep only one antivirus software. A, uninstall and delete other antivirus software, and restart the computer.

6. If the above method still fails, it is recommended that you restore or reinstall the system after backing up and saving important data to a USB flash drive or mobile hard disk.

If win8 system is pre-installed in the factory, you can start the machine and press F9 to restore the system. The specific method is as follows:

Press the power button to start the computer or restart the computer. When the computer is self-checking, please click F9- Wait for Windows to load and select an option screen, and then click Troubleshooting-Select to restore the computer or initialize the computer for recovery operation.

I hope the above information can help you. If the above reply still doesn't help you solve the problem, you are welcome to continue asking questions. You can also log on to ASUS online instant service: /support/ for further consultation with engineers. Thank you for your support and attention. Wish you a happy life!