Windows 8 not shutting down after long usage.

After installing windows update, I noticed that my laptop could not shutdown, hibernate or restart if i make use of it for a long time like 2hours and above. I only shut it down by long press and hold the power button. Anyone knows what the problem might be, i really need some help.. My laptop is Dell inspiron 15R windows 8.

Shutting down through the charms bar is the ideal method except in an emergency, continually shutting down by pressing the power button does not agree with Windows and may cause problems. For now type sfc /scannow in the elevated command prompt to fix any corrupt system files.

@Nuccii, Just tried it now but its saying i must be an administrator running a console session in order to use the sfc utility... Whatelse will i do?

Windows key + X and select Command Prompt (Admin)

1. Click Start, type secpol.msc, and then press ENTER.
2. Expand Local Policies.
3. Click Security Options.
4. Look in the 'Security Setting column to the right side of the Shutdown: Clear virtual memory pagefile entry.
5. If enable then disable it.

Download the attachement , unzip and double click to merge the registry