how to know the wifi owner blocked me or not?

[Ken]

Hi

Try the following ..

Start > type in ....cmd ... right click on cmd.exe that shows top left of screen
click on "Run as Administrator"
At the command prompt type ..... netsh wlan show networks mode=bssid
Now hit ENTER
You will see the wireless networks locally - and more importantly the signal strength as a percentage.

If the owners network is very low ( 5% / 10% ) you will not be able to connect.

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If this is OK then try a System Restore to a date when your WiFi was working.
Not sure which OS you have - Google .....System Restore..... with your OS ( Win 7 or Vista or XP ... )