I had my blog working fine but decided to move it from http://www.mysite.co.uk/blog to http://blog.mysite.co.uk but this has caused some problems.

When i try to login i go to the page http://blog.trading-talk.co.uk/blogs/htsrv/login.php

it goes to http://www.trading-talk.co.uk/blog/blogs/htsrv/login.php

where the file is no longer present.

Why is this?