If you have the latest ISO from Microsoft, it will have SP1 already. If you want to slipstream updates and drivers yourself, I recommend NTLite. I've made what we call the "MegaLoader", it has every useful edition of Windows 7 (Home and Pro), x86 and x64, plus VLM editions - all with over 230 updates (including the time-consuming .NET Framework updates), common networking drivers, USB 3.0 drivers, and more - all on one 16GB flash drive. sames us probably 4-6 hours per load...
I also found a way to trick a Windows 8 installer into installing the Windows 7 image, allowing ESD compression - the same image fits on a DVD. :thumbs:
Unfortunately due to Microsoft licensing, I can't share it outside of our shop, but wanted to let you know what is possible with NTLite and some hard work (that definitely pays off).
32-bit and 64-bit are possible on one ISO, it just requires third-party tools. WinToolkit lets you do it. Making a compatible unattend.xml is also possible for skipping a lot of the OOBE steps, you just have to double your XML pretty much for each architecture.
Edited by Demonslay335, 05 January 2016 - 09:58 PM.