The methodical instructions for laboratory and practical trainings contains a theoretical information on personal computers, Windows XP operating system, Microsoft Word text processor, and also short theoretical data and examples of projects in С++ Builder for calculation of complex mathematical formulas and solving problems with branching. This text book contains eight laboratory works with control questions and individual problems. The text book will be useful to students who are studying in English, at fixing a theoretical material, preparation for laboratory and practical occupations on "Computer science" course in the first module.