>>>Security log is empty ! Same with Application and system log. Any other idea ?
>>>Thank
>>>
>>Logon as Administrator, open Local Security Settings snap-in, change
>>Audit Policy to write to the log all faults. Logoff and then logon as regular user, start your app, logoff, logon as Administrator and check Security and Application logs.
>
>Ok, Did that, the only failure i get is SeIncreaseBasePriorityPrivilege, doest say anything about acessing registry ! But it's a start.
>
>Any other Ideas ?

Well, try to check out the User Right Assignment in Local Security Settings snap-in, may be you will find something wrong there.
Also, check the security settings for your controls if they are present in Component Services snap-in.