Problems logging in

I tried to access my blog and it asked for username and password. I typed in what I have always used and it said no such user. I had not upgraded to 2.5 as yet and thought that might be the problem. Took care of that but still couldn’t log in.

I then thought perhaps I had to register with a new name with the new upgrade and did so. Now I can log in using the new username and password, but there are no tabs available for writing posts, etc. I’m assuming it’s because the system sees me as a ‘additional’ user and not the primary, but I can’t log in with the primary because it says no such user.

Help?