The D7100 has been supported since ACR 7.4 while the D7200 has been supported since ACR 9.0 so unless there is a severe update glitch ACR should be supporting your camera and the use of obsolete Nikon software would be the likely suspect as Jim says.
Open one of your D90 NEFs or any JPG and see what version is listed in the ACR title bar when the interface is not maximized or via PS / Help / Plug-ins / Camera Raw.
If you are using older Nikon software to copy or even view the photos it WILL corrupt NEFs from newer cameras—Nikon admits this, and the solution is to retransfer the files from the camera or card without touching it with any Nikon software, using either the OS functions or perhaps LR, itself.
If the original NEFs are no longer on the original media then you can use the utility from the following webpage to reverse the corruption for specific cameras:
http://owl.phy.queensu.ca/~phil/exiftool/fix_corrupted_nef.html