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Limited Connection and Diagnostic Policy Service Not Working

Hi there, My Dell Venue 8 Pro has always connected to my WiFi. But since this morning and after coming back from a trip, it identifies my home network but it shows Limited connection and does not connect to the internet. I have updated the drivers of WiFi adapter from Dell. In fact in Network and Internet and Network Connections Wi Fi adapter appears enabled with signal (Dell Wireless). IPv4 and IPv6 connectivity appear as Not Connected but enabled, good signal and max speed. I already updated Qualcomm Atheros driver. But when diagnosing the connection a message appears: The Diagnostic Policy Service is not running. If I try to repair as Administrator it says the same. In Network and Internet>Network and Sharing Center the connection does not appear. So, any tip what I can do? It seems that the hardware is working but there must be a software problem. Thanks in advance.
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