Change Windows-version on FZ?

Please bear with my English since I'm not a native speaker. I'll try to explain as detailed as possible.

Right now I have a japanese Sony Vaio FZ. I bought it in Japan and brought it back to Sweden when I quit my job over there. Now, my father has an almost identical model. A swedish Sony Vaio FZ, but with a tad slower CPU. Thats the only different from what I can tell. And Swedish versus English (owner made) keyboard, of course. Both computers run Vista Home Premium.

Since I can't read everything in japanese, I would like to install a swedish OS on my japanese FZ, and tried to use my father's swedish recovery CD:s for his computer. But when the installation was about to start, it said something about wrong version and refused to install anything.

Is there a workaround of some kind for this? Is it even possible to do anything about it? Or is my japanese FZ forever locked to my pre-installed japanese Vista Home Premium?

(I also have a clean Vista CD for another older computer, but that one doesn't contain any drivers for my vaio what so ever. So I haven't even tried that one. Don't want to mess anything up, though.)

I don't need to do a semi-clean or clean install. Just want to be able to use the Swedish version.

Help would be appreciated... A alot!

 

Most recovery disks only work for one pc, not every pc of the same model. What you can do is use a program called nLite to make a copy of your dad's recovery disk, which will rip out the security that checks for his pc's serial, burn it and install it on your laptop.

 

Amazing if it works. Gonna try it!

Thanks alot!

 

Had to use vLite for Vista, but the app couldn't find any files when I inserted the DVD

looks like it doesn't like recovery DVDs/CDs