Keyboard Hook problem

I have a keyboard hook set up. I''m monitoring for Alt+L. The hook picks up the Alt+L well enough, but it executes the code for it twice.


        //PRESSED IS A BOOL THAT IS ASSIGNED FALSE AT APP INIT

	if (hooked->vkCode==0x4C && hooked->flags & LLKHF_ALTDOWN)
			if(!PRESSED)
			{
				messageBox(NULL, "BOO","BOO", MB_OK);
				PRESSED=TRUE;
				GetPassword();
				if (result==TRUE)
					UnlockStation();
				Sleep(20);
				PRESSED=FALSE;
			}

I''ve tried using a BOOL flag to prevent it from being executed twice, but this doesn''t seem to help either... Am I doing something wrong? How could I fix this?

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