thanks janrockt, thanks Thiersee. that did it. "Win7AIOSP1" is my short notation for "windows 7 all-in-one service pack 1". i suspected that mixing different tools would most likely break things but i read somewhere someone tried and succeeded. since i'm quite new to the topic i'm still rather adventurous. this setup has not yet proven stable! i have only gotten so far as to install it (chosen Home Premium 'cause that's what my purchased key is for) and log into my first session. i'm currently batch-installing the updates - still running. now, here goes my currently working Windows-7 all-in-one Service Pack 1 x64 iso making procedure for anyone interested subjected to discussion: extract iso file to foldermount install.wim from folder with wtk and strip all x86 from it (then rebuild and unmount)copy folder 3 times, once for each distromount each folder sequentially with winreducer, select distro and apply strip-settings from .wccf-file, not changing any services and adjusting the licence removals according to the current distro (takes ~30min each on 4 x 2.5GHz at high priority)merge the resulting .wim-files with wtk, apply tweaked services setup, add 1 language pack, add slim .net silent installer, apply vlite (winsxs and speech), not apply any removals and rebuildif applying an unattended.xml choose the full option (don't know yet if required)when installing to virtualbox choose ICH9 over PIIX3 and enable IO APIC in the system section of your vm's settings. the resulting iso has all x64 win7 distros in it, weighs 2.28GB, installs in ~25min until login on i7 Q740 8x1.73HGZ with 8GB Ram. there's still room for improvement. if applying updates one wim, duplicating it, upgrading the duplicates and merging them back together works this good, why not try and apply all changes including removals, addons etc. and go for it?