You can use Process Explorer, also from SysInternals, instead of Task Manager. In Process Explorer, Chrome has a "parent" process and each opened tab appears as a "child" process of this "parent" process. You can completely kill Chrome by killing the "parent" process. There is also an option, "Kill the Process Tree", but it seems it is not necessary in this case.

I think it may not be able to run from command line, probably it only works on XP.
But a useful think I discovered:

http://technet.microsoft.com/en-us/library/cc749337.aspx

"A Data Collector Set can be created and then recorded individually, grouped with other Data Collector Set and incorporated into logs, viewed in Performance Monitor, configured to generate alerts when thresholds are reached, or used by other non-Microsoft applications. It can be associated with rules of scheduling for data collection at specific times."

As an ex-beginner, I have 3 recommendations:
- practice: practice as much as you can, before and after you get your license; after you get your license, travel as much as you can on different types of road, from city-center at rush hour to mountain roads
- if you make mistakes, don't loose your confidence; it is just the normal process of learning
- if you find yourself in a situation when you have to make a choice (e.g.: an intersection), and one of the alternatives would put you into a dangerous position, don't do it; do just what you are confident you can do, even if the other drivers start to car

After 3000-5000 km you will become very confident into yourself and will know very good the car's limits. Be careful when changing the car. Every car behaves differently and the type of the motor (diesel or gas) as well as it's power are very important. If you plan to drive in Europe, it could be necessary to learn how to drive cars with manual transmission, as there are few cars with automatic transmission here.

Good luck and drive safe!