i have installed xp sp2 (stripped down installation using Nlite) and i removed some elements and services that caused serial port recognition problem, The Serial Port exists in DEvice Manager with ! under Non-Plug and Play Devices only when i choose show hidden devices. When i see the properties of the Device, it says Stopped. What are the important drivers, dlls, services etc for making the Serial Port in my Laptop work and be seen by XP? In bios, there are no settings for enabling or disabling serial port, so i assume the port is on by default and the problem lies in Xp configuration. Thnx in advance, sorry for my English, not my naitive language