Frog CMS

I’m working with IIS 5 , PHP 5 AND MYSQL 5
I installed the frog and everything went ok
I can see through the phpmyadmin all the tables are there,
when entering the site I can see it
when entering to the http://mydomain/frog_095/admin
then getting the username and password page – writing admin and the password that was supplied to me when installing the site which is 123ab9096K clicking “login” and getting bad page error and the link changed to http://mydomain/frog_095/admin/?/login/login

can you please tell me what can I do?

thanks a lot

Thanks, but it didn’t help me. I really prefer staying with IIS because I have more site with it in my server.
it’s really wired, does someone have IIS and succeed to get to the admin site? please let me know what I might do wrong? thanks