Change default sound card on all windows user accounts

Hello

I am trying to find a reliable method to change the default windows

sound card for all users who log onto windows that dont have

administrator rights.

I have added an additional sound card to a computer (a voip phone) and

windows switches all playback to the new sound card by default. I want

to make the original onboard sound card the default again. This is

simple on an adminstrator account - I go to 'control panel' then

'sound and audio device' then choose the correct sound card as the

default.

This works on the administrator account, but if anyone elso logs in,

the default sound card is the newly added sound card ie the change on

the admin account is not propagated to all the other user accounts.

The computer has a lot of user accounts, and the only solution I can

think of is to grant every user admin rights, log on to each user

account, then change the default sound card, and finally remove admin

rights.

Anyone got any ideas as to how I can change every user account in one

go?

Thanks

Paul