scheduled task polling setting WIN XP SP3

I am unable to locate this feature to change it's value from 02 to 38. Thank you for assist in finding.

 

If you tell us the reason, someone might be able to help you.

 

due to the following which was part of a Health Check report:The schedueled task polling settings should be optimized - The Scheduled task polling is currently set to 2. The actions specifys the strategy used for optimizing processor time on the system. It determines how much processor time the threads of a process receive each time they are scheduled and how much the allotted time can vary and the relative priority of foreground and backround processes. Setting a value of 38 for this setting will result in a smoother, faster response time for your foreground program.