Note whether Rainbow Six Siege crashes before the menu or during a match. Restart Windows, install game and graphics-driver updates, verify the installation in Ubisoft Connect or Steam, and test with overlays and hardware-monitoring tools closed. If it still crashes, keep the exact error and Windows crash details for Ubisoft Support instead of downloading replacement DLL files.
Write down whether the game closes before the menu, while loading a match, or after playing for a while. Save the exact Windows or BattlEye message because a named error needs its own article.
2
Restart and update
Restart Windows, then update Rainbow Six Siege, Ubisoft Connect or Steam, Windows, and the graphics driver from NVIDIA, AMD, Intel, or the PC maker. Restart again if an installer requests it.
3
Verify the game files
In Ubisoft Connect, open the game's Properties and use Verify files. In Steam, open Library > Rainbow Six Siege > Properties > Installed Files > Verify integrity of game files. Wait for the repair to finish before launching.
For one test, close overlays, recording tools, FPS counters, RGB utilities, overclocking tools, and hardware monitors. Do not disable Windows Security permanently; reopen tools one at a time only if the game becomes stable.
5
Return hardware to normal
If the CPU, graphics card, or memory is overclocked, return it to the manufacturer-supported default. Make sure vents are clear if the crash appears only after the PC has been hot for a while.
6
Send a useful crash report
If the crash remains, open Rainbow Six Siege Support and include the point of failure, exact error, game launcher, Windows version, GPU, driver version, and the changes already tested.
