Can't access the sites admin

I just installed a wordpress blog successfully. Then I wanted to change the url by removing the /wordpress after my domain. Unfortunately I was too quick and also removed the /worpress from wordpress address in the general settings. Now I can’t access anything. So I deleted all files on the server and tried to do the whole installation from the start, but that did not help a bit.

Of course I know I should not have done it, but I did, and how can I remedy this blunder. I would be ever so grateful if anyone could help me out.