Troubleshooting slow PC

 see

• https://windowsreport.com/kill-antimalware-service-executable-windows-10/
• https://thegeekpage.com/fix-corrupted-registry-in-windows-10-solved/
  

Things to do first:

• reboot
• disk cleanup
• windows updates

If the computer does not boot , maybe you need to recreate the boot manager :

bcdboot command

EFI partition MUST BE FAT32 formatted and is between 100MB and 500MB

If needed use diskpart 

• diskpart commands
• list disk
• select disk x (replace x by a number from the output of the previous command)
• list partition
• list volume (here you can see the filesystem type e.g;. FAT32 or NTFS ...)
• select volume x  (replace x by a number from the output of the previous command)
• assign letter=V:
• help format
• format V: FS=FAT32 LABEL=EFIBOOT OVERRIDE
• if you want to recreate the boot manager :
  exit
  bcdboot C:\windows /s V: /f UEFI

• bcdedit : managing Boot Configuration Data (BCD)
  Info from Microsoft:
  BCD files provide a store that is used to describe boot applications and boot application settings. BCDEdit can be used for a variety of purposes, including creating new stores, modifying existing stores, adding boot menu options, and so on
• bcdedit /enum active

Open a command prompt with admin privileges (approve UAC if demanded)

start diskpart -> diskpart

select your disk with efi partions -> sel disk 1 (if disk 1 is the correct disk)

list your available partitions -> list part

if partition 2 that is the efi partition -> sel part 2

detail part

Partition 2

Type    : c12a7328-f81f-11d2-ba4b-00a0c93ec93b  <<<<<< this means it is an EFI BOOT partition

Hidden  : Yes

Required: No

Attrib  : 0X8000000000000000

Offset in Bytes: 524288000

Now when the Required: property is set to No, you know that is the EFI partition you can delete. The other EFI partition will have the Required: property set to Yes. Do not delete that partition.

more info about the Required property, scroll to: gpt attributes on this page.

Edit:

to change the windows boot device (efi partition) use the following command:

bcdedit /set {bootmgr} device partition=a:

*where a: is the assigned drive letter for your new efi partition

Thanks to @mbrownnyc for looking up this information bcdedit Device Setting

The above useful info is copied from another website, hope the author doesn't mind ;-)

How do I find out which EFI system partition is in use by Windows 10? - Super User

• Create boot manager

This useful info below is copied from another website, hope the author doesn't mind ;-)

Windows 10 refuses to boot - Dec 2018 - NEED HELP FAST - Bootrec - Microsoft Community

bcdboot :Tool to use is bcdboot.

First you create bootable partition, format it and then use bcdboot command to create bootloader files.

Windows 10 Installation Media:

Insert the Media (DVD/USB) in your PC and restart.

Boot from the media.

Select Repair Your Computer.

Select Troubleshoot.

Choose Command Prompt from the menu:

Type in the command:

Diskpart

Type in the command:

List disk            (Note which disk is your Boot drive number mine is 0)

Type in the command:

Sel disk 0

Type in the command:

List vol               (Note which volume is the EFI partition mine is 4)

Type in the command:

Sel vol 4

Type in the command:

assign letter=V:

Type in the command:

Exit

Type in the command:

V:

After you have assigned a drive letter Using Diskpart You can format the EFI partition:

Example: if you assigned a letter V to the partition the command would be:

format V: /FS:FAT32

bcdboot C:\windows /s V: /f UEFI

Other useful commands: (use them at your own risk)

• Remove hiberfil.sys
  Start command prompt as administrator
  powercfg -h off
• Remove pagefile.sys on Windows 10
  sysdm.cpl
  advanced > performance > settings
• Disk scan:
  sfc /scannow
  DISM /Online /Cleanup-Image /RestoreHealth