If you protect the entire drive from writing, you won't even be able to run
the operating system as it writes data to various files on the system to
enable it to keep track of where it is and what it is doing. These
temporary files are also an essential part of almost all other programs that
would be used.
You would be better served to create a limited user account on the computer
to enable some functionality but prevent a lot of other issues. There is
also a policy editor that will enable you to stop some functions but that
must be used with extreme caution as it enables you to "cut off the limb you
are standing on and" totally crash the computer.
