...are listed in the C:\Documents and Settings\All Users\Start Menu or Desktop section.. It is possible to drag those icons to YOUR user profile only, therefore it would be difficult to access the program for other users...

In addition, make sure to create a different user profile for your grandson.. DON'T make him a use with admin rights.. Once that's done, you might want to read the Parental Controls article below:

http://www.microsoft.com/windows/products/windowsvista/features/details/parentalcontrols.mspx

Hope this helps.

Grif