In our driver RtlQueryRegistryValues works just fine, you can also try ZwSetValueKey,.... functions-> I think there is an example somewhere in DDK samples. Notice that only some parts of registry are available at startup. Waldemar n> Hello wdmaudiodev, n> Hi all!!! n> I just working on WDM driver but system refuses to load my driver in n> response to _ever link_ RtlWriteRegistryValue and alike funcs!!! n> So - How driver can read&write registry??!! ****************** WDMAUDIODEV addresses: Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx URL to WDMAUDIODEV page: http://www.wdmaudiodev.de/