So, I've solved all the problems :-) I'll tell you everything in order: 1) I installed Armageddon's Blade, and then installed The Shadow of Death on top of it (in the same folder). I updated The Shadow of Death. Random maps are now generated. 2) I disabled the second processor core. (In Device Manager, I replaced the ACPI Multiprocessor PC driver with ACPI Uniprocessor PC). As a result, the game no longer crashes (or freezes). 3) I wrote a DLL for the game that, for every 10 calls to the IsIconic function, makes one call to sleep(1). The result is that the processor load is 1-3%. In general, thank you all for your help :-)