My screen is frozen and i cant click anything

Can't you switch it off from the power button?

Also Task Host Windows is preventing me from resetting my pc

Ciao DominicTruong,

I'm Ugo, a Microsoft Independent Advisor willing to help other Microsoft customers.

Regarding your question, it looks like recent OS upgrades are causing issues, sometimese severe. So please try the below:

1. PERFORM A SYSTEM RESTORE OR A STARTUP REPAIR

a) Power on and off your computer three times. On the third time, your computer will boot into WinRE

OR

b) In Windows 10, select Start > Settings > Update & recovery > Recovery > under Advanced Startup, click Restart now.

OR

c) Boot to recovery media.

OR

d) You can configure a hardware recovery button (or button combination) to run a secondary boot path that includes WinRE. - https://msdn.microsoft.com/en-us/ie/dn898475(v=vs.94)

THEN

Follow the instructions below under "System Restore" or, if unable, under "Startup Repair":

https://www.lifewire.com/advanced-startup-optio...

2. If the above doesn't work, go again in WinRE

a) Click on Troubleshoot -> Advanced options -> Command Prompt

b) At the command prompt, type:

• bootrec /FixMbr and + ENTER
• bootrec /fixboot and + ENTER
• bootrec /ScanOs + ENTER
• bootrec /RebuildBcd + ENTER
• Exit + ENTER

The computer should reboot and allow the refresh or repair of Windows 10 to complete.

(http://www.dell.com/support/article/us/en/19/sl...)

3. GO BACK TO PREVIOUS WINDOWS VERSION

If less than 10 days are elapsed from your upgrade, you can try the below under "Go back to your previous version of Windows"

http://www.thewindowsclub.com/rollback-uninstal...

4. If none of the above works, proceed with a clean install:

DOWNLOAD OFFICIAL WINDOWS ISO FILES

https://answers.microsoft.com/en-us/windows/for...

PERFORM A CLEAN INSTALL

https://www.howtogeek.com/224342/how-to-clean-i...

If there are files on the drive you want to recover, see:

https://answers.microsoft.com/en-us/windows/for...

DISCLAIMER: In this post are linked some non-Microsoft websites and there may be ads on the pages for products & services including products frequently classified as a PUP (Potentially Unwanted Product). Please thoroughly research any product / service advertised on the pages before you decide to use them. Your discretion is very much advised.

Please let me know if this helped somehow.

Ciao

Ugo