Unable to start any service. (error 1084 this service cannot be started in safe mode)

Go to Start > Run > type 'regedit'
Take registry backup( Go to file-) Export-> Save)
Then Go to-:
Edit > Find > 'SafeBoot'
When the SafeBoot key is found in the registry there should be two subkeys, 'Minimal' and 'Network', if there is a third subkey 'Option', delete the entire option subkey and the problem will be solved

Unable to print(Spooler subsystem app has encountered a problem and needs to close.)

Step 1:
Restart your computer in Safe mode

Step 2:
Delete the printer and driver files

Browse through the following locations and delete all the files:

C:\Windows\System32\Spool\Printers.
C:\Windows\System32\Spool\Drivers\w32x86


Step 3 : Remove the Windows NT Subkeys
Take registry backup.
Got to :-
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print\Environments\Windows NT x86

In the subkey list, there should only be the following subkeys:
a.Drivers
b.Print Processors

If there are any subkeys other than the subkeys that are listed delete it.

Step 4:

Go to :-

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print\Monitors

In the list of subkeys, there should only be the following subkeys for the default print monitors:

BJ Language Monitor
Local Port
PJL Language Monitor
Standard TCP/IP Port
USB Monitor

If there are any subkeys other than the subkeys that are listed delete it.

Exit Registry Editor.
If a printer is attached to the computer, disconnect the printer cable from the computer, and then restart the computer in normal mode. Reinstall printer driver.