I need help. windows vista failed to boot onto an old windows 2000 operating

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I bought a used laptop on ebay. all the hardware is still there and it was as described as far as on the sellers end. I get here and the bios come on. It comes with the recover disc and even the micrsoft authentication for microsoft and all that. He's been the only owner of this one so I have all the paper work. I went through and changed the bios for it load from the dvdrom and it gives me this "Windows failed to start. a recent hardware change might be the cause to fix the problem:" Then you go through steps 1-3 and I do that but when it comes up to ask me for the language it doesn't get that far. I have the recovery disc and I actually have a new windows vista dvd rom for a completely upgraded OS. at the the bottom of the message it gives Info: Ramdisk device cration failed due to insufficient memory. I rebuilt my computer but laptops are different. I know the basic components and the inforamtion about partitioning the files for vista because I had to partition my old one where it had windows xp but system crashed and i had to install new hard drive and new OS. I've spent most of the day yesterday looking into the problem on microsoft and find the error but don't find the exact error in what mine is doing. can someone help me. I'm not stupid on networking and software. I just need to know what direction to go in. It pulls up the bios and it's reading both disc otherwise the information wouldn't come up like it does.