most editing options dont seem to work

Hoping someone can help. Am brand new to wordpress but have successfully installed on my windows 2003 server using iis, php 5 and the latest mysql.

However most of the options in the admin portal do not seem to work, the help and screen options dont work, themes cannot be edited, text being typed is white and cannot be seen until published, etc.

I have gone through alot of the forum posts but nothign seems to help, I have tried making additions to the wp-conifg such as the concatenate scripts and debug tags and even tried completely removing mysql and reinstalling both that and wordpress but no joy.

feeling a bit frustrated so all help gratefully received.