In some times you will need delete ADFS Site. So follow the command:
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appcmd” runs under the command prompt and is found under “C:\Window\System32\inetsrv”.
appcmd delete app “Default Web Site/adfs/ls”
appcmd delete app “Default Web Site/adfs”
In C:\inetpub delete adfs folder
At IIS, application pools delete ADFSAppPool
Also, check the updates in the control panel – KB974408 – and remove it.
Check C:\Windows\WID\Data and C:\Windows\SYSMSI\SSEE\MSSQL.2005\MSSQL\DATA
In both folders, check for files that start with adfs and then delete this files.
Check the SPN and do a good cleaner in the regedit.
Finally, reboot the server.