DELL INSPIRON 1545 WINDOWS VISTA BOOT

I am having the same issue. I just bought this laptop from somebody who had completely erased the laptop before selling to me , telling me I had to reinstall windows vista onto it. I tried putting disc in and as the laptop (Inspiron1545) reboots, it loads to DeLL screen and option for setup and boot pressing f12 comes up and when selected, options come up where I select CD\DVD then the entire DELL screen comes back loading over and over again. loads, goes black like its trying to boot , white blinker comes up at top right, then just reloads over and over again.

I have run a diagnostic and everything has passed including extended diagnostic. What do I do ?! I just purchased this laptop and it is not working ? Please help if you could. If directly emailing me will make this easier please, feel free to !!

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Thank you !

-Chelana Vandusen