Slush Pool Not Recognising GUIMiner

[JoshDog]

Dear all,
I have just tried bitcoin recently because I mostly just watch youtube videos on my powerful GTX 970 Rig and wanted to make some money while the system is idling.

I have followed all of the tutorials I can find and it has lead me to using GUIMiner and Electrum for my wallet.

I can connect to the Slush Pool just fine and it happily goes up to 550 MHash/s but, when I log into the Slush Pool, it says that my worker is Off even when it has a Scoring Hash Rate of 0.90 Gh/s (what does this mean?)

Here are my GUI Miner settings:
http://imgur.com/11bGoJn

Am I doing anything wrong? I have followed all of the tutorials on this matter and they all pretty much say the same.
I am on Virgin Media in the UK if that helps...

Here is the console of GUIMiner:
http://imgur.com/HUjpVnH

Cheers,
Josh

[kano]

Using a GPU will lose you WAY MORE money than you'll ever make with it.

550 MH/s is expected to make around 0.00005 BTC, mining non-stop for the next 100 days

Edit: or to put it in perspective with current mining hardware, a Avalon6 is 67,000 times faster than your 'powerful' GPU.
i.e. your using a tricycle to race a fighter jet over a 100km race.