- At times, when you are trying to update your windows system, some essential dll files or registries files may be missing or corrupted.
- Install or uninstall programs in a bad way and infected with Virus or Trojan.
- Device drivers are damaged or installed wrongly.
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1. You must run as an administrator, no matter what steps you will do about your PC.
2. According to the version of Windows you're using, the above steps may be slightly different, but the basic process is mostly the same.