WP Search

I have an issue with my WordPress Search, it is running WP2.7 and whenever I do a search it comes up with this weird URL structure:
http://www.kimstewart.ca/blog/?s=test&submit.x=0&submit.y=0&submit=Search

How can I fix this and have it read http://www.kimstewart.ca/blog/?q=test instead?

Thanks!