add Diagnostics -> Repair WMI page

content/diagnostics/_index.md

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+---
+title: "Diagnostics"
+order: 3
+---

content/diagnostics/repair-wmi.md

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+---
+title: Repair WMI
+order: 1
+authors:
+  - Aytackydln
+---
+
+AuroraRGB needs Win32_Process class in WMI to work properly.
+Here you can follow the steps to fix it for Aurora and possibly other software.
+
+
+1) Open a terminal (as Admin):
+   - In the start menu type "cmd" OR
+   - Right click "Start" button and choose Terminal
+
+2) Enter following command:
+   > net stop winmgmt
+
+3) Open a Windows Explorer and locate the path to `C:\Windows\System32\WBEM\` folder 
+and rename the **Repository** folder to something else like RepositoryOLD.
+
+4) Restart the computer
+
+5) Open a terminal (as Admin)
+
+6) Enter following commands:
+    > net stop winmgmt \
+    winmgmt /resetRepository
+
+7) Restart the computer