errors after switching hosts

Hi.

I just switched hosting companies and was able to install WordPress, import my database, etc.

However, I cannot get my page to display properly. When I try to activate any plugins, I get this error:

Warning: Cannot modify header information – headers already sent by (output started at /home/superjux/public_html/wordpress/wp-content/plugins/get-recent-comments.php:2170) in /home/superjux/public_html/wordpress/wp-admin/plugins.php on line 16

Any advice?

Thanks!

Hilary

And apparently this one:

Warning: Cannot modify header information – headers already sent by (output started at /home/superjux/public_html/wordpress/wp-content/plugins/get-recent-comments.php:2170) in /home/superjux/public_html/wordpress/wp-admin/link-manager.php on line 233