2.0 Preventing Stack Overflow Stacks are temporary data structures that MS-DOS and applications use for processing hardware events. If, while setting up Windows, Setup detects hardware or software that require a certain stack size, Setup will place the following command line in your CONFIG.SYS file: stacks=9,256 This should be sufficient most of the time. However, if you receive the Internal Stack Overflow message when running Windows in 386 enhanced mode, or if your system fails for no apparent reason when running Windows in standard mode (especially if you are setting up or moving the mouse), first try increasing the second number on the stacks= command line (for example, 256) If that doesn't work, try increasing the first number (for example, 9). For more information about the stacks setting and modifying the CONFIG.SYS file, see your MS-DOS documentation. .