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Download the software: https://www.ubnt.com/download/unifi/
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Close any instances of the UniFi software on the controller
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Open the command prompt as an Administrator
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Locate the java installation directory.
On 32-bit machines, it’s usually found at “C:\Program Files (x86)\Java\<JAVA.VERSION>\bin”;
For 64-bit machines, “C:\Program Files\Java\<JAVA.VERSION>\bin”;
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Add the dir above to the PATH (as seen under Computer->Properties->Advanced system settings)
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Change directory using the command cd “C:\Users\<USERNAME>\Ubiquiti UniFi”
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Type “java -jar lib\ace.jar installsvc”
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Set “UniFi Controller” service in services.msc to automatically restart after failures