atm.menon wrote: why its happened only some times Impossible to tell without a lot more diagnostic information.

You already posted this in the C++ forum; please do not crosspost, it wastes everyone's time.

Hi, Thanks for your reply. Hmm.. I have just shared the folder( permission to everyone i think). The problem is still exists when UAC is enabled( my UAC settings is default) and I run application as admin. Its works fine when UAC is disabled( i.e Never notify). Thanks Arun