Dual boot vista-ubuntu, can't boot ubuntu

[se_landy]

So here is the problem: 6 months ago I had only XP on my laptop. Than I installed ubuntu. Dual boot worked great. 5 days ago, I installed vista, and now i can't boot ubuntu... When i press the power button, vista boot automatically. there is no grub that would ask me which OS do I want to boot...:(
I could reinstall ubuntu, but I have some files in my old Ubuntu there that I would want to save...
Any ideas how to work this out and to save my data without reinstalling vista or ubuntu???

[Partyboi2]

When you installed vista it would have written to the mbr. You should be able to restore grub using a ubuntu live cd. See here (http://ubuntuforums.org/showthread.php?t=224351)

[kspncr]

When you installed Vista, it definitely wrote over GRUB. It seems you have already been pointed in the right direction, but personally, I find it easier to use the SuperGrubDisk (http://www.supergrubdisk.org/)