Applications available to all users

[PD]

Hi

I have just installed xp and I am having problems making
programs available to all users.

I have made each member of the family a user of our pc
with the children being limited users.

When I install a program ( I am an administrator) it
doesn't seem to make the program available to the others.
Is there a way I can inform " XP " that I want the
program to be available for all ( or for that fact just
selected users)? I can't seem to find any info on this
part.
Thanks
PD