Hi All, I am working on a telecom project. I am facing CPU 100% problem. Can any one tell me different reasons for a system CPU to reach 100%. I am reading a telephon number from a text file after that dialing the same number. After successfully done I am deleting the text file and updating the counter in DataBase (SQL). All these operations are done within a thread. The Application is a multithreaded application. I am not able to trace why the system CPU is reaching 100%. OS is Windows NT. Waiting for your suggestion(s). Thanks in Advance. Kumar.