I try to add a few things on 8102, and hopefully add a few more later, but first thing first:
1. To get back the old start menu, open regedit, goto
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer
change value of RPEnabled from "1" to "0"
close regedit, you get your old start menu......the catch is, no more metro UI because you just disabled it. To get back the Metro UI, change the value back to "1"
I had ran thru the other thread, and agree with some members : this is progress, try to adapt to it, use the old thing as a temporary way until you get use to Metro.

2. Install on Hard-disk to dual boot with win7
Do-not try to install 8102 within win7, it won't ask you which partition you want to install, and go stright to install on C, and your win7 is gone.
You need to burn the ISO to a DVD or USB FD, boot with it, then set-up will ask you for the partition, everything goes like win7 installation.
3. Dual/multi-boot with XP
8102 still uses BCD but it doesn't care about XP, so after 8102 is installed, use VistaBootPro to install the "Vista Bootloader" back to the system partition, then set-up the bootmenu with VistaBootPro.
Of course you can use EasyBCD, I don't want to install it just to show the basically similar procedures.

Update 1:
Actually you can install inside win7(or other windows) and it is very simple: After mounting to a virtual CDrom, people tend to fire up the setup.exe on the root dir, and it will cause win8 setup to install directly on C, and put the win7 in windows.old.
The correct way is to go to the sources folder, there is another setup.exe in it, and firing up this exe file will begin install by asking you the partition to install.
Update 2
If you are one of those unlucky chap who installed 8102 over win7, and must have to get the win7 back, here is the MS tech page on how to restore XP from win7. I have not tried but read over the article, the steps should basically be the same:
http://support.microsoft.com/kb/971760
Update 3








