Upgrade Vista 64 to Windows 7 64

Hi this is my first post. My mother got her first laptop(md7818u) over Christmas last year and loves it. I recently purchased an NV79 within the last 6 months and i love mine, basically because I got a "free upgrade" as it is advertised as having an i3, but my device manager says i5 .
Hers came with Vista 64 bit, and mine obviously came with Windows 7 64 bit. I created the backup disks via the Gateway recovery management as you have to make your own rescue disks now. I tried to create hers, but the second disk won't burn; the first one does. I called Gateway and they looked through it and found a file was corrupted which prevented me from making the second disk.
They also installed an app called desktop manager by iyogi. The rep scanned the computer and came across more than 6000 problems reported. He said he could repair them and make her computer run like new again and offered a 3 year warranty for over $300, and a 1 yr for $179. She refuses to pay that amount when all she wants are her system restore disks, which the rep told her cost around $40. He also said to uninstall the McAfee AV and put Microsoft Security Essentials on instead.

My question is that is it possible that I could use my Windows 7 recovery disk on her computer(seeing as they are both Gateway brands) to upgrade her to Windows 7? Also, what would this do to the system partition, or does it even matter?
I am not computer dumb, but decided to post here first rather than just doing it myself, just to be on the safe side. I can back all of her stuff up so that's not an issue. Not so sure about MSSE, but would like another opinion. I personally prefer Eset NOD. Any input is greatly appreciated.

Yes I understand that recovery disks are brand and model specific, however there is a Dell edition of Windows Vista floating around the web that installs Vista without having to be activated via MS. This being said, I am curious about whether or not this corrupted file could be overwritten with a file from a different computer, then edited to compensate for the original corrupted file? Also, she(my mother) plays alot of Facebook Farmville, and has also downloaded the snag bar. I am wondering if this has anything to do with all the errors, or the corrupted file?

My girlfriend has an HP that she got about 2 years ago, and i was STILL able to create backup disks of her computer, and it has had all kinds of stuff installed, uninstalled on it.
As you mentioned, it is probably a manufacturer thing, but I don't know if they could remotely fix the problem without having to ship the whole computer back.
This being said, I don't think her computer has had a virus on it. The closest thing that has come close is when my brother installed magic-jack software on her comp. which kinda threw it out of whack and slowed it down tremendously. Thanks for your reply.

Thanks for your responses!