Steam keeps validating game files
You can tell Windows to run on the game on only one CPU core to solve this problem – this is referred to as setting the game’s CPU affinity.
The easiest way to do this is by launching a game, alt-tabbing out, opening the task manager, right-clicking the game’s process on the Processes tab and using the Set Affinity option.
Steam will examine the game’s files and – if any problems are detected – will re-download the corrupted files from Steam’s servers.
To validate a game’s cache, right-click the game in your Steam library and select Properties.
Corrupted files can also cause a multitude of other odd game bugs.
To fix corrupted game files, you can have Steam validate the game’s cache on your system.
One trick you can use is setting Steam.exe’s CPU affinity instead – when you launch the game through Steam, it will inherit Steam’s CPU affinity and launch with the correct CPU affinity.You can disable the overlay for an individual game by right-clicking the game in your Steam library, selecting Properties, and unchecking the Enable Steam Community In-Game check box.Windows automatically assigns compatibility mode settings to certain programs – including Steam – when they crash.What I have tried to do in order fix this issue: - Verified integrity of game files; - Updated driver cards; - Reinstalled the game; - Restarted Steam/Uplay/computer; - Started Steam/Uplay/Tom Clancy's Rainbow Six Siege as Admin; - Went to the game directoryand deleted three files, as it was said in previous threads: 2 in "Shop Items" and 1 in "addons". cant play the division because of crappy server disconnections and now cant play R6.