What is the "ctredr15.sys" ? Our database contains 2 different files for filename ctredr15.sys . This files belongs to product Caretaker Redirector and were developed by company SurfRight B.V.. This files have description Caretaker Redirector. This file contains driver. You can find it in the Drivers section of the System Explorer.
As it usually relates to the PCI Express card I assume its part of the drivers for your graphics card.