Windows vista user profiles?!

When i switch my computer on it gives me the option of two user profiles. I want to get rid of them so that it switches on straight to my desktop but i don't know how to do it.
Niether profile seems to be administration and if i try to make changes on eiher one it tells me that i do not have permission. Is there anyway of just deleteing them bot so i just get one desktop?????

 

I was just looking through some other threads and i did that
"Start > Run > something "userpasswords2" thing. Its got two accounts inc one that must have belonged to the previous owner (I bought from cash generator).

Guest: Administrators;
Hussey: Users.
I can't do anything to these because it tells me that i do not have permission in either profile.

To be honest i have no idea what i'm doing and if i carry on trying to do this on my own i'm likely to render this damn thing useless so i'm going to try to leave it alone and go to bed in the hope that, help will be at hand in the morning.