Changing the computer name causes Oracle to not exist for the target host or object

The hand has changed the computer name,

The result is that the Oracle database logged in to the following error, a search for information, said to have modified the computer name caused by the need to go to the Oracle installation directory: \oracle\product\10.2.0\db_1\network\admin directory found Listener.ora and Tnsnames.ora.

Modify the host value, host = change to its own computer name

But the Oracle installation directory does not remember where, this time you can open the cmd window, enter path, enter to see the installation path of various software:

Find the Listener.ora file, open with notepad++, you can see the original computer name and Oracle home, I would like to change back to the original computer name, to ensure that other software is not affected

Changing the computer name causes Oracle to not exist for the target host or object