'Safari can't connect to the server' - not sure why?

Hi everyone

I've tried looking up past similar questions ( https://discussions.apple.com/thread/3245104 ) but I've been going round in circles a bit so thought I'd try my own post.

My Macbook looks like it's connected to the internet but when I open Safari it says 'Safari can't open the page 'hhtp://www..google.co.uk/' because Safari can't conect to the server www.google.co.uk' and no other web sites will open.

I'm on an old pc at the moment which is working fine and having no problems connecting to the internet, so it seems like just a problem with my macbook.

Any help would be greatly appreciated!