The List Of Processes You Should Not Try To Terminate

Task Manager allows to view the list of currently running processes; it can be used to change the priority of a process and/or terminate a process. However, certain processes are vital for normal Windows operation and terminating them will result in unstable or hung operating system, thus leading to possible losing valuable data.

Here's the list of processes that should never be terminated:
alg
csrss
dfssvc
explorer
lsass
msdtc
services
smss
spoolsv
svchost
system,
System Idle
taskmgr
winlogon
wmiprvse

Some of them couldn't be, in fact, terminated via Task Manager, but that operation should not be attempted in any case.