Cant log in to the game...

I just looged to my account in the web site, clicked on Start Game and nothing...
I tried to log through the file of maplestory that I've got in my compputer and nothing happened...
What can I do?

Check if Maplestory.exe is still on your processes and kill it. For some reason I occasionally have to get rid of it.

I cant delete it for some reason... :S

A quick restart will probably fix this, it does happen on my old computer every once in a while.