A
com.android.system.ad is undesired malware installed as a system app. It overlays your device with adverts and downloads other apps onto your device. It may be accompanied by other malware. It has probably been dropped onto the device by a one click root application such as kingroot or kingoroot. You need to deinstall this using a system app removal tool together with other malware apps. You will also need to replace the superuser app with a non malicious alternative and remove the kingroot or kingoroot application from the device. Accompanying malware may reinstall this on your behalf. The error may be occuring because accompanying malware processes are running without root permission.when i try for anything to do then on screen display com.android.system.ad has stopped