Bootmgr is missing, need help!

[skav2]

Ok it was totally my fault for this one, i was trying to install ubunu onto my Acer aspire 5100 pre installed with Windows vista, i was doodling around with it and made my 2 hard drives active and now every time i start up the computer it says Bootmgr is missing hit Alt + ctr + Del to restart. Ok i tried using the windows vista intaller to fix - didnt work - i also tried using all the vista cds it came with like recovery and stuff and the comp wont boot from cds so nothing happens when i put in cds. Can anyone help?