As I wrote in my edit, I did try with SP3 on both languages, and it didn't help one bit. Ok now, what I have is: English Windows XP SP3 from MSDN Norwegian Windows XP from who knows where with SP3 slipstreamed. Looking a little at the files on both version, I can indeed see that for example driver.cab is 75mb on the norwegian one, and 61mb on the english one. Most files seem to differ in size, even the many many small ones (which cumulate to a relevant size in total for my task). Considering that windows XP is windows XP, could it not be possible to copy over enough files from the english version to the norwegian one and replacing those there, thus making the files equal and taking half the space on the final cd? I suppose what I'm asking about is if anyone knows anything about how the install cd is structured, with relation to different language versions. Is there one big file or a few ones which hold the language differences or are they all spread so much out that it be a thourough pain, if not impossible to achive my goal, of only selecting the neccessary different files?