Vista installation again & again

[Dante]

I have finished with my new install. Now when i pressed the start button it checked for all the hardware part and then wants me to install operating system. Here when i put the Vista installation disk enter the serial no. starts installation & again goes back to the initial screen & starts the test hardware thing & follows the steps again. I installed Vista & it asks me to install it again why?

[Dante]

Some more information, i have 2 HDDs & want to install Vista on my primery HDD ie. 500Gb other i have is 250GB
It also ask me to put the serial no again for installation of Vista.

[Bozena]

Ok try installing Vista when you have only one HDD attached your primery 500GB HDD. & see what happens
OR you just set your 500Gb HDD as the primery HDD from the bios setup.
One more thing when you finish install Vista & booting up then try going into Bios & forcing your PC to boot from HDD first & then the CD/DVD ROM.