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Same thing started happening to my laptop about a week ago, after installing the same update (KB2962407). The problem was rectified after uninstalling the update.
Intel Core i5-3210M CPU 2.5GHz
NVIDIA GeForce GT 630M (1GB VRAM)
Realtek High Definition Audio
Windows 8 (NOT 8.1)
When you say "placing my computer at risk", I presume you mean in terms of its security. Given that Microsoft has stated the following on the update page:
"This update rollup package includes performance and reliability improvements. We recommend that you apply this update rollup as part of your regular maintenance routines."
and viewing the list of issues that follows, I doubt that there is anything to worry about security-wise.