Comment 142 for bug 441941

This problem also exists with Grub legacy.
I had the issue with Grub 2 on my Dell Vostro1300 laptop. Recovery instructions on grub.enbug.org/Grub2LiveCdInstallGuide worked very well (thanks a million to the author, I really appreciate this!). However it was just not feasible to reinstall grub every time after working with Windows (Even I needed Windows just every other day).

I thought to get rid of this problem by downgrading to grub Legacy. I reinstalled one of the previous Ubuntu distributions which came with grub legacy, and then upgraded one by one to Lucid Lynx (yes, I did it that complicated).

To no avail - problem is back after second or third time that Windows and its programs grabbed their internet updates. No idea which piece of software exactly is the grub eraser ...

I guess I'll check out if my old notebook still can run Windows, and will keep my main notebook for Ubuntu ...
Quite frustrating ...