new user account issues...

Hello,

I'm having an issue and can't seem to figure it out.

Every time someone signs up for a new account, and click the activation link in the email, they go to a page
that shows them...

Warning: require(../wp-load.php) [function.require]: failed to open stream: No such file or directory in /home/blogtwis/public_html/wp-admin/upgrade.php on line 4

Warning: require(../wp-load.php) [function.require]: failed to open stream: No such file or directory in /home/blogtwis/public_html/wp-admin/upgrade.php on line 4

Fatal error: require() [function.require]: Failed opening required '../wp-load.php' (include_path='.:disappointed:usr/lib/php:disappointed:usr/local/lib/php') in /home/blogtwis/public_html/wp-admin/upgrade.php on line 4

If anyone can help me figure it out it would be GREAT!~

OH - you can see it yourself by setting up a test account at: http://www.blogtwister.com

Thank you,
- Patrick