writing to registry in vista from guest account

Hi,

My application fails to write into registry key. When it runs in user/
guest account.

When I install my application in administrator, the installing process
creates reg key in HKLM.
I compile my application using manifest.
After the installation I create new user/guest account and runs the
application from that account.
The failure is when my application tries to write to the registry I
get the following error:
"Requested registry access is not allowed". I use the following code:
Note that I can read with no problem. My application doesn't fail in
administrator account.
try
{
// I get "Requested registry access is not allowed" error here...
RegistryPermission rm = new RegistryPermission
(RegistryPermissionAccess.AllAccess, TCPRoot);
rm.Demand();
}
catch (Exception e)
{
throw new Exception(e.Message);
}

RegistryKey myRegKey = Registry.LocalMachine;
myRegKey = myRegKey.OpenSubKey("SOFTWARE\\Giant Steps\\SLIP\\TCP",

RegistryKeyPermissionCheck.ReadWriteSubTree,

System.Security.AccessControl.RegistryRights.FullControl);
try
{
myRegKey.SetValue("Subnet", subnet);
}
catch (Exception e)
{
throw new Exception(e.Message);
}

Is there a way to write to a HKLM key which was created in admin
account from user/guest account?

Thanks.
.

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