Wolfram just released a new version of Mathematica to fix the bugs in the last release (see previous post). As some of the bugs patched can cause a “system crash”, it is recommended that anyone using 11.0 upgrade as soon as possible. The list of fixes are listed on the Wolfram site.
The install files are on the Windows share \\ditto\rc\Mathematica11.0.1
Note that this is not a patch, but a new install – you may be requested to remove 11.0. If so, please remove that version.