When selecting the restore point, and systhematically going back in time, you can open a submenu each date, to see what gets changed each time.
Every restore point can show what gets "undone".

Safe option would be to take note of those changes.

Do the restore to the date before IE11 installation.
Goto=> the Microsft site to install the patch to prevent IE11 installation.
Run Windows updater (if you want to ) and all other updates will be performed exept the IE11 install.

Or? ? ?
Wait for SM to come with a patch to make PoserPro 2012 failsafe for IE11.

They released one for Poser9, so? Perhaps one is in the making for PP2012 too?

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!