Okay so that’s exactly the problem with the new Windows 7 boot manager. Most people (like you and me) don’t _want_ to deal with GRUB, so they install Windows 7 first, then install Ubuntu or Kubuntu and let the installer sort it out. The problem with _that_ procedure is that the _existing_ GRUB installers point to the MAIN windows 7 partition, and not the super small 1mb boot partition.

So basically what u want to do is boot off of your Kubuntu LiveCD, and then in the terminal do something like:

sudo grub
root (hd0,1)
setup (hd0)
quit
sudo shutdown "now" -r

Hope that works for you. Make sure u modify ur grub list too! Again, there’s quite a few guides out there that’ll help u, one from the post, and one from @Peter in the comments

I installed first windows, then i try to install kubuntu 9.10 just for don’t having this problem. But the install of grub at mbr seems not effect, on rebooting, windows enter without the screen and options from grub.

if possible that windows uses other boot sector ? what’s happen ?

on using gparted, it shows me a lot of partitions: 2 of them are “unalocated”, one have 1 mb size, other have 7,02mb. One have taking my attention, is the hd(0,1), a exclusive partiotion requested by the windows instalation that in grub shows as boot, not the primary (hd0,0)

If possible to install grub at this partition ? how i can do this for grub menu appears and i can realy choose my system to start ?