Connection to network but not internet

I have this problem with my laptop, it was fine then all of a sudden when I turn it on after work it wouldn't connect to the internet, it's connected to the network and has excellent signal strength, but internet isn't working.

I've tried to repair the connection but it comes up with "Can't clear the DNS cache", I'm not sure what it is and what to do about it...

There are no firewalls or any other things blocking access to it either.

Are you able to connect the laptop via a wired connection just to diagnose whether it's the wireless playing up or the router.

Oh yeah, sorry, I can use a wired connection through the router.

It's just weird that it saids "Cannot clear DNS cache" and offers no hints to solve the problem...

Actually no, after successfully repairing the connection, it is still not being able to connect to the internet...

Sounds weird, you could try getting the latest drivers for your wireless card from the manufacturer's website.

And maybe try clearing the DNS cache manually, go to start menu -> run, type cmd, then in the dos window type "ipconfig /flushdns" without the quotes

Well I've tried that, without much luck, this is really frustrating and annoying...