Windows 10: here i am unable to install any application in my laptop sudenly. it gets start and get...

mu Microsoft store is unable to install any application.

:)

 

Office 365 programs: Application unable to start correctly 0xc0000142

He already did that. The list of what the OP tried is long and it includes pretty much everything I'm aware of *Sad

How about temporary disable AV and any antiransomware product, and run Office repair again?

Edit: just now have i finished reading the part of the post describing how you deleted Windows.old.
This could be related. Normally, Windows doesn't need that old installation, but in some cases, some files could be needed..


Try with Repair install of the Windows.

 

The application was unable to start correctly (0xc00000e5), click ok to close the application

the steps you recommended for clean boot i cannot even go through one step of it because for each step they are showing the same message - The application was unable to start correctly (0xc00000e5). Even settings
or control panel is not opening. please help me. i have an exam in a month and all my materials are in the laptop and i cannot open anything at all.

 

mmc.exe - Application Unable to Start (0xc0000102)

When i'm trying to run anything from the MMC or any MSC related apps in my local account (An Administrator), all i get is an error : The application was unable to start correctly (0xc0000102)., and if i do try running mmc.exe, all i get is a Blank MMC, and the taskbar name "Console1". But if i do try running it thru an elevated CMD, i can start them fine (Example: compmgmt.msc). I have tried running SFC, DISM, and chkdsk /f /r, but they all do return a "normal" answer (all is fine).

Steps Reproduced:

1. SFC/ SCANNOW: no integrity violations
   
2. DISM: all is good
   
3. chkdsk/f /r - initially what caused the problems in MMC, and other areas of the laptop. I ran a chkdsk command from my laptop when it suddenly caused a bootloop. (Stuck in Preparing Startup Repair)
   
4. regsvr32 msxml.dll/msxml2.dll.msxml3.dll: msxml and msxml2 not found in sys32 folder. only msxml3.
   

Workarounds:
1. Start .msc's from Elevated CMD

Other related Problems Found:

1. Missing MSXML and MSXML2. (but sfc and dism still does not recognize these problems)
   

Is there any fix to these problems? Aside from a full reset (a last resort)?