MySQL Problem ERROR 2005 (HY000): Unknown MySQL server host ‘localhost’ (0)

The problem occurred after you installed window7:

1	ERROR 2005 (HY000): Unknown MySQL server host 'localhost' (0)

I was able to solve this problem by modifying my list of hostnames:

1	C:\Windows\System32\drivers\etc\hosts

Make sure that you have the following entry:

1	127.0.0.1 localhost

This ensures that the host “localhost” resolves to the IP address 127.0.0.1.