All platforms: If you're experiencing frequent errors and crashes on your computer, a bad stick of RAM is often the culprit. Free diagnostic boot CD Memtest86+ checks system memory for errors without pressing a key. After burning the tiny downloadable ISO image (less than 2MB ) to a disc (we recommend ImgBurn for this task), you can use it to boot any computer directly into the standard memory test. More advanced tests can be run under the configuration screen, but the standard test should detect most memory errors. Armed with that information, you can replace or swap out the offending memory stick.