The Problem

The mouse stutters, the whole desktop hangs for ten seconds, or the PC reboots while you were only browsing. "Random" freezes usually have a pattern—after sleep, during games, when a USB device is plugged in, or right after an update. Narrow it down before replacing hardware.

Solid blue screen with a stop code? Use the BSOD guide—that is a hard crash with a logged error, not a silent freeze.

Symptoms

Cursor moves but nothing opens (hard hang).
Brief freezes then recovery—often disk or RAM pressure.
Unexpected restarts with no blue screen (power, overheating, or kernel crash).
Only one app freezes—see app keeps crashing instead.

The Fix: Step-by-Step

Step 1: Check Task Manager During a Freeze

If you can open it before the next hang: Ctrl + Shift + Esc → watch CPU, Memory, Disk at 100%.

Disk pegged → 100% disk usage.
Memory pegged → high RAM usage.
CPU pegged + hot case → overheating.

Step 2: Install Pending Windows and Driver Updates

Settings → Windows Update → install everything, then reboot twice. Stuck updates cause odd stalls—fix Windows update stuck if it never finishes.

Update GPU, chipset, and storage drivers from Intel/AMD/NVIDIA or the PC vendor—not generic "driver booster" installers.

Step 3: Run System File and Disk Checks

Terminal (Admin):

sfc /scannow
DISM /Online /Cleanup-Image /RestoreHealth
chkdsk C: /scan

Reboot after sfc reports repairs. On SSDs, chkdsk scans logical errors; on HDDs schedule a full check if prompted.

Step 4: Test RAM

Win + R → mdsched.exe → Restart now and check for problems.
Let it run one full pass. Errors mean bad RAM or unstable XMP—see check and upgrade RAM.

Step 5: Review Reliability History

Win + R → perfmon /rel → Reliability Monitor.
Click red X days—note Windows Hardware Error, LiveKernelEvent, or app names repeating before crashes.

Prefer a guided pass? You can diagnose crashes with My Technician—it walks system analysis, driver checks, and reliability events in one app.

Step 6: Clean Boot (Find Bad Startup Software)

Win + R → msconfig → Services → check Hide all Microsoft services → Disable all (non-Microsoft) → Apply.
Startup tab → Open Task Manager → disable all startup items.
Reboot and use the PC. If stable, re-enable services and startups in halves until the culprit returns.

Step 7: Storage and Power

C: drive nearly full causes thrashing—free up disk space.
Laptops: use Best performance power mode while testing; weak batteries can cause sudden shutdowns mistaken for crashes.
Desktops: reseat RAM and power cables; cheap PSUs fail under GPU load.

Step 8: When It Won't Shut Down Either

Hang at "Shutting down" points to a stuck driver or service—fix not shutting down or restarting.

Still Random After All That?

Back up files, then reinstall Windows without losing data if software corruption is likely. If freezes continue on a clean install, log hardware errors in Reliability Monitor and test RAM again—software is ruled out.

How to Fix Windows 11 Freezing or Crashing Randomly