darren12,
Does not matter which operating system you are hosting on, both should be fine with WP. There may be a few differences but nothing that should be that noticeable.
I agree with macmanx on the server log request. They may not be able to provide the actual log to you but see if they can at least attempt to run wordpress on you site from IIS and report on the error the server is stating. Sometimes when executing an application directly from the server, it will output more information to assist in your troubleshooting.
The problem with many hosts is that the tech you are working with does not have direct access to the server to do these kinds of tests. That is one thing that CrystalTech support techs have over the others…direct server access ??
You might try re-uploading a new install of WP just to be on the safe side. You might also see if Fasthosts has a WP installer or even ask if the tech is willing to maybe download it for you and attempt the install while on the phone. WordPress is popular because it just works and as long as all the files are there for the install, especially a brand new one, you should not have any issues.
I would really try to get your host involved with this and if they are not willing to get WP going then I would start the process of transferring to another host. Good luck.
