winlogon. exe-application error The instruction at 0x5ad72f93 Refered memory at 0x00040000 The memory card could not be read. Click ok to terminate Click cancel to debug. I receive this pop up every time I click to turn off the computer. Clicking on ok or cancel does not work. I can only turn the computer off at the tower. My computer is a h.p. , xp media service pack 3. If you have an answer please make it simple, because I'm not very computer literate. thanks 
