error in database with comments

I just transferred my site to a different host. However, something was wrong with the database. My previous host (ipowerweb) was having a lot of problems with their servers which is why I switched, and I noticed the error is showing up on my database there too, so it’s not a problem with the switch. Something mucked it up, and I’m noticing it only in the new place. The blog itself looks fine, seems to load okay.

However, when I try to open the admin page to post anything I see a blank screen with this error message:

WordPress database error: [Table ‘./mysite_wp/wp_comments’ is marked as crashed and should be repaired]
SELECT COUNT(*) FROM wp_comments WHERE comment_approved = ‘0’

Warning: Cannot modify header information – headers already sent by (output started at /home/mysite/public_html/presentmatters/wp-includes/wp-db.php:121) in /home/mysite/public_html/presentmatters/wp-includes/pluggable.php on line 275

I checked the databases on the control panel and it is not showing an error on the comments table as noted, so I’m not sure how to repair it. Checking on the control panel is about the extent of my database knowledge.

Thanks for any help you can provide.