I have cod1 ISO I had mount it up and installed successfully, it runs fine on the multiplayer mode but when I switched to single player mode it give an error about : PLEASE INSERT THE CORRECT CD-ROM, SELECT OK AND RESTART APPLICATION
*** help me
My PC SPEC
Model

Hewlett-Packard HP

CPU

Intel® Pentium® 4
CPU 2.80GHz

RAM

1Giga Byte

GPU

Intel®
82915G/GV/910GL
Express Chipset Family