User as an admin

[Niranjan Roy]

I have this peculiar problem. To run many of the programs
on windows XP professional machine, I need to be logged
on an Administrator. I have a user account within a
particular domain.

To make this user (my user account) as an administrator
on my machine, I login as an admin and add this
domain/user account and give it the administrative
rights. Now I log off and log back in as this user who
has the admmin rights on the machine. Everything works
fine.

Now if I shut the machine down and restart it again, I
find the user which I created with the admin rights is no
longer there. So I have to repeat the whole process
again.

I have no idea why this happens. Does anyone had similar
problems? Most importantly, does anyone have any clue on
how to solve this issue?

Thanks a bunch!