Wifi not working since 10.10.3 update

Hello,
Almost exactly in time with the latest update being installed, my McBook Pro has ceased to conenct to my home wifi service.
I can see a full strength wi-fi signal but no connection to any website is successful.
I have read some suggestions after a google search that this may be linked to the update.
Can anyone help me please?
Martyn

Go step by step by step and test.
1. Power off the router. Unplug it from the wall. Wait a while.
    Plug it back to the wall. Power the router on. Wait until all the lights are lit properly. It will take a while.
    Restart the computer.
    Start up in Safe Mode.
    http://support.apple.com/kb/PH14204
2. Delete Caches.db
    Close all windows and quit all applications.
    Hold "option" key down and click "Go" menu in the Finder menu bar.
    Select "Library" from the dropdown.
    Library > Caches > com.apple.Safari > Caches.db
    Right click the Caches.db file and select "Move To Trash.
    Close windows and relaunch Safari.
3. Empty Caches
    Safari > Preference > Advanced
    Checkmark the box for "Show Develop menu in menu bar".
    Develop menu will appear in the Safari menu bar.
    Click Develop and select "Empty Caches" from the dropdown.
4. Delete Cookies
    Safari > Preferences > Privacy > Cookies and other website data:
    Click “Details” button.
    Remove all cookies except from Apple, your ISP and banks.

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Message was edited by: wakazashi

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