...Separate pls (Score 1)

We all understand the reasons behind code reuse (well mostly) but we also know that when a security hole is present it may ripple into many other system that may not on their own be vunerable. Why is it that windows still uses Explorer and IE (which are essencially the same..i think??)...tho i believe i read somewhere that the graphics and kernel will be separate now...this looks like an idea got from unix type systems...while i commend this effort i would like to know why the most vunerable parts of the system, or most likely attacked component are not compartmentalized so that breaching of these part does not ripple into other systems...which tho it may not solved the problem, will allow less to be compromized....a bug is only a bug if you can find it!!!