grub

I'm using grub (0.5.96.1.cvs20010530-6) and since a few days I get the following message while booting the system: There are differences between the bootsector and it's backup. Differences: (offset:original/backup) 28:3d/3f, 29:65/00, 30:9c/00, 71:44/00, 72:41/4f, 73:54/20, 74:45/4e, 75:4e/41, 76

grub booting message

I'm using debian woody and grub. Since a few days I get the following message: There are differences between the bootsector and it's backup. Differences: (offset:original/backup) 28:3d/3f, 29:65/00, 30:9c/00, 71:44/00, 72:41/4f, 73:54/20, 74:45/4e, 75:4e/41, 76:20/4d, 77:20/45, 78:20/00, 79:20/00