Finally I found the problem
Problem was the firewal McAfee. I give full access to the qbittorrent app.
It should be done thougth Firewall-> Internet connection for programs->
Access -> Full
Net Guard -> Off
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I have the same problem. I reinstalled the program and nothing. It crash as soon as is started. I tried with uninstall and deleted everithing with CCleaner but the same error. Finally I tried with delete and delete all files under C:\Documents and Settings\ <<USER>> \Local Settings\Application Data\...