Vista - To what level can i configure user accounts?

Can i use different user accounts to be able to choose between different
performance settings for different tasks? I know u can configure desktops and
the total graphic interface of Vista for each user but what about hardware,
service and startup settings.

Example:

One account for best (offline) gameperformance (unused hardware and services
turned off, no background security programs, low vistagraphics)

one account for safe surfing ( lot of security programs running, networking
and communication services)

and one account for working(only services and hardware for the applications
I need for work)


Or is there a better way of doing this. I would like to be able to switch
between systemperformancesettings with just one or two clicks.


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