I have not yet corrected this. Whenever the OS choices appear at boot time, I simply choose the atest kernel. Because ii works, I have not attempted the suggestions of the other posters, but I plan to after I finish learning Samba, NFS, and the several other parts of Linux I've become preoccupied with
I just got an alert to upgrade to yet another kernel, so perhaps I will fix this subsequent to doing so. I think it involves commenting out the lines in the grub.lst file, as suggested.