Securing IE

Ok, this will probably sound stupid, and because I don't possess the security knowledge of a lot of the people in this community I thought it'd be wise to hear from the experts.

It seems the greatest risk of infection is through browser exploits or browser object exploitation.

Would running browsers in a reduced security context (knowing that most windows users run as a superuser) assist in mitigating the risk of exploitation? or does the exploitation allow the code to run in a priviledged context regardless?

To explain more about my idea, im thinking about creating a new user of the system, remove it from all groups. Provide access only to program folder, and for an extra measure deny access to c:\ and %systemroot%

so would this have any effect?

thanks,

Pix.