Deleting Electrum wallet and setting up new one
If you're using Electrum on Windows, in my opinion just checking that it is signed with the correct code-signing certificate is sufficient; if any security beyond that is desired, you should use a hardware wallet with Electrum. When you open it, if the Windows UAC prompt says the file is &quot;from the verified publisher Electrum Technologies GmbH&quot;, then that should be assurance that the file is the correct Electrum installer.
However, if you just want to delete the wallet files from the old Electrum installation, they are typically located in %appdata%/Electrum.