Either your computer cannot reach the pihole on its lan address or your computer is not being told to reach the pihole on its lan address. If you have reinstalled pihole and get the same issue then it would be likely the problem is somewhere other than pihole itself.
Do you have ufw on your pihole, have you allowed port 53 if so?
What DNS server is your router suggesting? You can do the following in windows cmd to see:
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