Where can I find an updated guide on the registry keys and entries of the latest version of Microsoft Security Essentials for all versions and editions of Windows 7 SP1?
No idea what does it creates, but if you really want to know it for sure, you may use something like Regshot to compare the registry before and after the installation and get the differences from there.
BTW, why do you want to know the exact details about installation?
It's also going to be hard since it install a few services and probably a kernel-mode driver for monitoring the file system.
My Computer
Computer type
Laptop
Computer Manufacturer/Model Number
Toshiba Sattelite A665-S6092
OS
Windows 7 Ultimate x64
CPU
Intel Core i7-740QM
Memory
8 GB DDR3
Graphics Card(s)
NVIDIA GeForce 330GT
Screen Resolution
1366x768
Hard Drives
Samsung 840 SSD 500GB
1TB USB3 external HD
Cooling
Coolermaster Notepal U3 notebook cooling pad
Internet Speed
3mbps ASDL
Antivirus
ClamWin 0.98.7
Browser
Opera 12.17 x86 (main), Firefox 38 (sec), IE11 (last resort)