I Have Serial Key But Lost Install Disk

Lost
Hello folks, I have a gateway DX 4300 desktop which i have just brought back to life by installing a new hd (old one died). I am currently running a boot copy of xp. I would like to get back to vista because it is not recognizing the video cards or the soundcard in xp. I DO get sound from my headphone jack(which is located in a different place than the onboard sound card). It has enough recognition to give me a monitor image (using my led lcd through the hd slot in the PCI card) But the video i get is choppy and not nearly up to what it should be. I belive this is a problem with XP and my box, drivers ect..because the box was made with vista and came out after they were mostly done using xp. No to mention the PCI slot video card came even after that..(but not sure when)
I have looked for model specific drivers on the gateway website and tried them all. NONE work in xp correctly. My processor is 64 bit..(this particular boot copy of xp is 32 bit)so id imagine the vista home premium I had on the other HD was 64 bit as well..and i think i need 64 bit again..?
Like the title says, the box IS legit and has a product key on the side. The farthest i got on this problem was dl a few diff copies of supposed good vista...one of them i set up to boot from flash and tried it..it got to the enter product key stage and i did and it said something like invalid product key or that it could be verified..cant remember exactly what it said. THEN i clicked install w/o product key or whatever it was to be able to do it later..and it said can't load either instal.wim or boot.wim(can't remember which one.) ( I MAY NOT have had internet while attempting the install i described.)
I believe i dl a copy from digitalrivercontent and put it on the xp box..when i went to install it started the windows vista setup and started extracting...about 3 min later it said somethin like cannot extract to this folder, please make sure your extracting/copying to the same folder you downloaded it too..whatefver that means.
Just wondering what the next loical step would be here.. I just want a a working copy of vista home premium on my box like it came with. I do not have the recovery disks or any other disks as I got this system second hand.from a friend that did not have the disks on hand either..
Sorry its so long and somewhat complicated problem..Just trying to share all the info/actions i've already tried.
REALLY not trying to spend any money on this as it does have legit product key and was runnin vista until the factory hd died.

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