I'll attempt to write down what i usually do.
Before reinstalling i do this.
1. Find out if the computer has a model name/number.
2. Use a program to find out a detailed system spec. (Note down important items e.g. gfx card, motherboard model/name.)
3. Check if the computer has any hardware installed that did not originally come with the box. (E.g. TV Cards.)
4. Back-up any data required. (I always ask).
5. Then download the drivers and put them on some removable media e.g. a pen drive or if you want just the NIC driver as normally after an reinstall the NIC will not be installed and its hassle to download the drivers etc from another computer.
Then Reinstall Windows as you usually do.
After the installation i normally.
1. Install the NIC driver first, then download and install all the drivers i've noted down. (From the previous steps)
2. Restore the data. (If any)
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I would avoid trying to copy over drivers as some of the drivers could be outdated, its best just to go with the latest manufacturers release, it will prevent problems.
You can buy DVD's with loads of drivers on them but they can be dodge and are best avoided, who knows what could be on them.
If you seem to be getting the same computer through a lot e.g. same hardware and model. You could create an unattended installation CD which could have all the drivers on etc. but that depends on what your getting really.
Bumbling through seems the best option if most of the computers you get are different.
Hope that helps.
