A few install questions

First off. Can I change my admin password through mysql? I see the admin table but the passwords seems to be a hash of the original. How can I put in a new password? I need to change it this way because I must have fat fingered the password when I set it up.

Also, Is there any way to get the email working if my ISP blocks port 25? I know I can change the port number but I could never get my email to work unless it was port 25.

Actually I reinstalled and the admin is still not working. I made sure the password is correct. After I put in my username and password it goes back to the same screen.
I had the cart setup earlier and everything was working but I reinstalled it and now im having problems.

I have 2 installations and im having the same issue

any help you can offer would be great