Why is the window update stuck on Windows malicious software tool update?

I have windows 8.1 and I started my windows uodate yesterday at 9 pm. It took almost 45 mins fir the uodates to download then I clicked in installing the updates. Since 9:45 pm last night the installation is stuck on 25 out 67 updates and the update that has been installing is the windows malicious software tool. Its almost 12 hrs now. I even tried stopping the installation and restarting the ststem. But before restarting the installation process has started again. Please help to reaolve the issue

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