sound permission

Hi!
I have a Realtek AC97 onboard soundcard.
It works just fine when I add my user to Administrators
group but if I remove myself from the Administrators group
I don't get any sound. It seems like the program
trying to use the sound card doesn't have access.

If I try to play Windows startup sounds under Control panel
it gives me this error message
http://www.hot.ee/heydrich/pl2ma.JPG
I also checked device manager to see if any device drivers
arent installed properly but everything was fine.

I have spended hours searching for similar cases.
There are some occasions where people had similar problem
but none of them had any reasonable solutions.

Also visited
http://www.kellys-korner-xp.com/top10faqs.htm
and tried everything under the section ...
Where did my Sounds go?
and there was no result!

I dont think the problem is in the sound chip/driver or
in the fact that it is onboard because I manage small
network off PC's and they all have the same problem.


Any ideas how can I solve the problem?

sound permission