Import Caused Major Error

I used the wordpress import plugin to import blogs and comments from another blog to my web site and it has caused a major error in my site….it can no longer upload and I get an error message.

Firefox has detected that the server is redirecting the request for this address in a way that will never complete.

How do I fix this ?

http://ww.wp.xz.cn/extend/plugins/wordpress-importer/