Re-install vista

Question

Hi,I bought my computer Acer T690 in 12/12/2006 it had windows vista installed from Acer in it. I had XP and took the vista off the computer. I had didn't get any recovery disc's i went and asked the people where i bought it they said they can't do anything. (Leading Edge in Bacchus Marsh) i got really bad service from them.( if i didn't i would not mention them). I have tried to get the registry keys and it doesn't work. i have keys and numbers etc. on side of computer , microsoft and acer. If i put the serial number in acer it says not the number . can anyone help?thanks fuzzy