Problem with guestbook

I have a problem loging in the admin account in Adv. Guestbook. Everything was working fine but once time I tryed to login and I couldn't. So I uploaded the original files (that i downloaded form you) to other directory on the server. Then I created a new SQL database and user. Then ran the install.php and created new tables. I got to a page that says click here to login to admin. So I tryed to login as test - 123 and it doesn't work. When I click on ok it looks like it works but It won't let me in. Im using a Linux host and apache. Is there something that I have to get rid on a server so I would be able to login. (hhaccess I could not delete) Can someone help me please I searched threw the forum and noone had a same problem as me they had similar but not the same as me. So I couldn't find the answers. to see what I'm talking about when I say I can't login as test and 123 go to http://www.youth4j.org/gbook/admin.php
Thank you in advance.

worked perfectly for me. I could log in, and do anything I wanted

Worked for me also, have you got your cookies enabled?
try to get this sorted quickley and change your passord and login

Thank you
I went to my Internet Options and deleted my cookies and It worked.
Thanks alot.