well my usual routine
1. take the case, screw in the
motherboard standoffs in the right place (9 for most ATX boards, hold your board above to double check them)
2. next put in your power supply, screw it to the case
3. take cpu, motherboard, memory and cpu cooler, install cpu on motherboard, install cooler on motherboard (plug in fan as well), put in the memory sticks
4. now put the i/o shield that came with the motherboard in the hole at the back, then gently put the motherboard in and screw it down, then connect motherboard 24+4/8 pins. Also connect any casefans to the motherboard, or directly to the power supply
5. take the front pwr switch, reset switch, pwr led and hdd led cables, and connect to the bottom right of the motherboard (check motherboard manual for exact pin layout) Also connect any front USB ports to the motherboard (again, manual)
6. put in your graphics card, connect power cable(s)
7. screw in or slide in (depends on case) hard drive and optical drive, connect power + data cables
now you should be done
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read : motherboard manual (for which SATA ports to use, case i/o pin layout, and so on) & case manual (so you know how/in which direction you need to put the optical drive in for example) download them in .pdf and start right away
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for the windows stuff :
http://www.winsupersite.com/article/windows-7/clean-install-windows-7-with-upgrade-media option #2 worked for me
I assume the digital download is just a Win 7 upgrade .iso which you put on a DVD or
USB stick?