How to restore Mac OS 10.7.3 from time machine?

Hello I would like to restore my OS to 10.7.2 after the upgrade to 10.7.3.
I have time machine, and backups before and after the fatal update.
But I worked between and created files so I do not want to completely restore my system but only the OS / system part.
Is it possible ?
How does it work with Time Machine ?
Thank you for your kind help

Hello John,
Work done !
it hasn't been as easy as hoped, but it finally worked.
--> install Leopard OS from DVD
--> download and install lion from App Store (already in 10.7.3)
--> copy of my data
what a relief, I haven't lost anything.
I didn't understand at first how time machine worked, so it created another user on my new OS.
I wanted to suppess the user, and it took ages, sooo long so I had to shut the computer by holding the power butter 5 secs.
Clean reboot, everything seems OK. I tried to check permissions and there are files with wrong permissions. Just a bunch, but auto repair do not work.
Someone have an idea to repair this ?
The OS is working fine anyway.
RESULT :
the Wi-Fi is back, and behaves normaly. The computer goes to sleep, wakes, then the WiFi is automatically back.
Well I should try it for a couple of days.
Moreover, the system seems more responsive and faster than before. It was already good, now it is excellent.

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