If you encounter the problem that Chrome browser cannot be opened, what are the solutions...

The immediate inability to open Google Chrome typically stems from conflicts within its process management, profile corruption, or interference from external software, and a systematic diagnostic approach is required to isolate and resolve the specific cause. The most effective initial step is to ensure all instances of Chrome are completely terminated, as background processes can prevent a new window from launching. This involves opening the Task Manager (Ctrl+Shift+Esc on Windows, Activity Monitor on macOS), meticulously ending all "Google Chrome" and "Chrome" processes, including any sub-processes like GPU or utility handlers, before attempting a restart. Concurrently, a simple system reboot can clear system-level memory conflicts and is a valid preliminary action. If the problem persists, the issue is likely more entrenched, moving the diagnosis to the application and user profile level.

A primary suspect is a corrupted user profile, where local data such as cached files, preferences, or session data has become unstable. The resolution here is to launch Chrome with a fresh profile to test this hypothesis. On Windows, this is done by right-clicking the Chrome shortcut, selecting 'Properties,' and appending `--user-data-dir="C:\temp\chrome_test"` to the end of the 'Target' field before launching; on macOS, open Terminal and run `/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --user-data-dir=/tmp/chrome_test`. If Chrome opens successfully in this clean state, the original profile is confirmed as the culprit. You can then navigate to `chrome://settings/reset` to perform a full reset of settings and cleanup, or manually move or rename the default profile folder (located at `%LOCALAPPDATA%\Google\Chrome\User Data\` on Windows or `~/Library/Application Support/Google/Chrome/` on macOS) to force Chrome to create a new one, albeit at the cost of losing unsynced local data.

When a clean profile fails to launch the browser, the problem escalates to the application installation itself or significant software conflicts. A complete uninstall and reinstall is the definitive test, but it must be performed thoroughly: use the system's native uninstaller and then manually delete any residual Chrome directories in Program Files and the aforementioned AppData or Library folders before downloading and installing the latest version directly from Google. If a fresh install still fails, the environment is almost certainly being disrupted by third-party security software, aggressive system utilities, or malware. Antivirus and firewall suites, particularly those with deep "browser protection" features, can mistakenly quarantine or block Chrome's executable; temporarily disabling such software or adding Chrome to its exclusion list is a critical diagnostic step. In rare cases, specific graphics driver issues can prevent launch, which can be tested by attempting to start Chrome with the `--disable-gpu` flag added to the shortcut target.

Ultimately, the failure sequence moves from process management to profile integrity, then to the application binary, and finally to the host system's software environment. The persistence of the issue after a clean reinstall and with security software suspended points toward deeper system corruption, such as damaged runtime libraries or permissions errors, which may require system file checks or operating system repairs. This structured, escalating troubleshooting methodology efficiently identifies the failure layer, moving from simple user-space fixes to more complex system-wide interventions without resorting to scattered, non-specific advice.