Windows 10 Sudden Sluggish Performance. 100% memory and disk usage.

Open Start > Settings > Privacy > Background apps

Disable all Background apps.

Disabling Windows Update:

Press Windows key + R

Type: services.msc

Hit Enter

Scroll down to Windows Update

Select it then right click it

Click Properties

Under the General tab, choose Startup type to DIsabled

Click Stop

Click Apply then OK

Also, check whats starting up with Windows.

Press Windows key + X

Click Task Manager

Click Startup tab

Disable all except Windows Defender.

Also, open Start > Settings > Privacy > Background apps and disable all.

Open Start, type: problem reports

Hit Enter

Delete any failed or pending reports.

Go to Start > Settings > System > Notifications and actions > Turn off "Show me tips about Windows."

If you have Chrome installed, uninstall then reinstall it.

I would suggest you to perform clean boot and check if any third party application is causing the conflict. Please follow the instruction mention in link below and check.

http://support.microsoft.com/kb/929135.

Note: After you have finished troubleshooting, follow these steps to boot to normal startup.

a) Press the ‘Windows + R’ key on the keyboard.

b) In the ‘Run’ windows type ’MSCONFIG’ and click ‘Ok’.

c) On the ‘General’ tab, click the ‘Normal Startup’ option, and then click ‘OK’.

d) When you are prompted to restart the computer, click ‘Restart’

Hi Nagendra, nice system !

The number of SvcHost processes is more than likely not the problem. Since the Creators update it is notmal to have 70 - 90 of these running, but the total system resources is minimal . . .

When your system becomes unresponsive:

Press Ctrl + Shift + Esc to open Task Manager

Look for what is running at maximum (Disk, RAM, CPU)

Click the header on the column that is hogging resources

Please provide a screenshot of the processes that end up at the top of the list after clicking on the appropriate header (expand any processes that need to be)

Also, you say you disabled Superfetch in Command Prompt?

Click your Start Button, type services and hit Enter

In the Services App, scroll down and make sure Superfetch is Disabled and not started, if not, that is the place to disable it . . .

So after spending 2 hours+ trying to figure out what was wrong with windows. I finally simply "restarted" my computer instead of "shutting down" and then powering it back up manually. I don't know what the issue was or how it was resolved by doing a restart vs. shut down but it completely solved my problems. System is back to stable and usage levels are down to their normal values. This was an un-explainable and incredibly annoying problem as I genuinely cannot think of the source of the initial problem. 

The superfetch is still disabled and I will just keep it like that since I plan on upgrading to an M.2 SSD in the coming weeks.

Open Start > Settings > Privacy > Background apps

Disable all Background apps.

Disabling Windows Update:

Press Windows key + R

Type: services.msc

Hit Enter

Scroll down to Windows Update

Select it then right click it

Click Properties

Under the General tab, choose Startup type to DIsabled

Click Stop

Click Apply then OK

Also, check whats starting up with Windows.

Press Windows key + X

Click Task Manager

Click Startup tab

Disable all except Windows Defender.

Also, open Start > Settings > Privacy > Background apps and disable all.

Open Start, type: problem reports

Hit Enter

Delete any failed or pending reports.

Go to Start > Settings > System > Notifications and actions > Turn off "Show me tips about Windows."

If you have Chrome installed, uninstall then reinstall it.

So after spending 2 hours+ trying to figure out what was wrong with windows. I finally simply "restarted" my computer instead of "shutting down" and then powering it back up manually. I don't know what the issue was or how it was resolved by doing a restart vs. shut down but it completely solved my problems. System is back to stable and usage levels are down to their normal values. This was an un-explainable and incredibly annoying problem as I genuinely cannot think of the source of the initial problem.

Hi Nagendra, nice system !

The number of SvcHost processes is more than likely not the problem. Since the Creators update it is notmal to have 70 - 90 of these running, but the total system resources is minimal . . .

When your system becomes unresponsive:

Press Ctrl + Shift + Esc to open Task Manager

Look for what is running at maximum (Disk, RAM, CPU)

Click the header on the column that is hogging resources

Please provide a screenshot of the processes that end up at the top of the list after clicking on the appropriate header (expand any processes that need to be)

Also, you say you disabled Superfetch in Command Prompt?

Click your Start Button, type services and hit Enter

In the Services App, scroll down and make sure Superfetch is Disabled and not started, if not, that is the place to disable it . . .