First of all, thanks...skornel. I understand your answer, however; I am trying to enable and disable the USB Ports (HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Services\\USBSTOR), which is already by default. It's not something that I created my self. Is there a way to modify this key val when the program is running with a limited account?. Thanks. Regards, JH

Right now I run the code with a administrator user and works just fine, but when I do it with a limited account user the first time works just fine but the second time gives me this error: ERROR_ALREADY_EXISTS = Cannot Create a file when that file already exists. This is what I'm doing: 1.- LogonUser; with the administrator account. 2.- ImpersonateLoggedOnUser 3.- RegOpenKeyEx Does anyone knows how to work this around? Any help is greatly apreciated. Thanks... JH

I have a dll that runs two functions: One is to disable the USB porst.... TWO is to change the WinLogon keys: DefaultUserName and DefaultPassword. These two functions use the LogonUser function that I pass the administrators account. It does not works fine the first time executing like this. USB WINLOG AS LIMMITED ACCOUNT Everytime I try to LogonUser the user after executing the second function it gives me an error: Uknown user name or bad password. Everytime I do it I use administrator's account. Any help will be greatly appreciated. Regards, Jose

Could any one help me understand this?. I am reading an array of bytes and one of the fields is a long for the amount and I get this big number: 800000000 when it should be 80000. Do I still have to do format the value to something else? Regards, :)

Could anyone explain to me how to format a long value as a date time value?. This is because I am using Btrieve as a data base and the datetime fields are store as long types. Any help is greatly apreciated. Regards, :)