Hi Simonas,
A corruption in one of the Windows Update components may be causing the update not to be installed properly. It can be a problem with the Software Distribution folder, where downloaded updates are saved on your device, or it can also be associated with the services connected with Windows Update. Since you're unable to access the Services or use the command prompt, we recommend that you use the guided walk-through to help you resolve issues related to Windows Update.
If you'll still encounter problems after following the steps using the guided walk-through, we suggest that you perform an in-place repair on your device. Performing this task will not damage files and applications that are currently installed on your computer. The process will only replace corrupted components on your operating system.
Keep us updated with the results.