Comment 28 for bug 441941

First I don't have sufficient experience and I haven't investigated this problem, but this is what other says and what I think.

The problem isn't grub2, the problem is HP backup (or PC Angel), it write their things into the boot sector and suppose that this boot is the Microsoft boot that have a fixed size and structure. Grub2 have more size than grub1 and other structure that have windows and then PC Angel write into it deleting Grub2 data (because in this part windows don't have nothing).
The solution that I think that can be do is to detect if it is a HP computer and advise to the user about this problem (I don't know if this is possible).

If you think that this is a big problem, send an e-mail to HP.