Having problems after beeing hacked!

Firstly thanx for sorting that out for me

My guetbook page was up and running in no time. Now, my problem is I can't log in as administrator. It seems it doesn't recognize the username or password.
I've tryed to reset it as recomended in your forum but with no success,
Can you help me?
www.pedro-g.com/guetbook

ps. also need help disabling the html.

Thanks a million x

www.carbonize.co.uk/reset.zip is a sxcript to reset username and password.