DB error with comment subscribe

Hi,
I’m still on 2.1.2, with the comment subscribe plugin installed, and I just started getting the following error message on all admin pages:

WordPress database error: [Got error 28 from storage engine]
DESC wp_comments

WordPress database error: [Duplicate column name ‘comment_subscribe’]
ALTER TABLE wp_comments ADD COLUMN comment_subscribe enum(‘Y’,’N’) NOT NULL default ‘N’

I’m a complete MySQL noob, but I tried to take a look at the table, and I get a similar error:

SQL query: Edit

SHOW FULL FIELDS FROM wp_comments ;

MySQL said: Documentation
#1030 – Got error 28 from storage engine

If anybody could help I’d be most appreciative.

Thanks!