in the first Challenge. Keeps crapping out on that one. WHY?!
Closes Brink and shows this, the window is called "Brink Server"

00:18 to load maps/sp/challenge_06.entities
sdAbilityManager::OnLocalPlayerClassChanged: 0
Received abilities from client 0
...'grenade_molotov' set as bind 0
...'landmine' set as bind 8
...'charge' set as bind 16
...'spotting' set as bind 17
...'repairing' set as bind 18
...'disarming' set as bind 19
...'building' set as bind 20
...'revive' set as bind 21
...'hacking' set as bind 22
...'sprinting_reload' set as bind 23
...'hardened_skin' set as bind 24
...'power_maximum_increase' set as bind 25
...'sprinting_grenade' set as bind 26
...'give_ammo' set as bind 56
...'life_buff1' set as bind 57
...'weapon_buff1' set as bind 58
...'disguise_self' set as bind 59
17 abilities set
done setting 17 local abilities
WARNING: No Spawn Found.
All Stats Cleared
OnIntroCutsceneStart
SoloCam1
WARNING: game time hitch of 114 ms. game is now lagging behind sound by 114 ms
WARNING: game time hitch of 353 ms. game is now lagging behind sound by 467 ms
Ran1Setup
OnIntroCutsceneEnd
New Score mod
1
Player Team: resistance
Fade in victory splash
Spawn event1
Syncing stats to clients...
WARNING: GetNetVarFloat: 'maps/challenge_06/fuse_time' 25.000000 clamped to 30.000000 (min: 30.0000 max: 30.0000)
One Star Script Run
startline hit
Ok Startline is in mapstate 1 now
Ok Startline is in mapstate 1 now
Ok Startline is in mapstate 1 now
Ok Startline is in mapstate 1 now
Ok Startline is in mapstate 1 now
Ok Startline is in mapstate 1 now
Ok Startline is in mapstate 1 now
Ok Startline is in mapstate 1 now
Ok Startline is in mapstate 1 now
Ok Startline is in mapstate 1 now
Ok Startline is in mapstate 1 now
Ok Startline is in mapstate 1 now
All Stats Cleared
All Stats Cleared
Mapscripts: setup objective from match state
...OnMatchStatePrimary 0
...OnMatchStateOther 0 0
...OnMatchStateOther 1 0
...OnMatchStateOther 2 0
...OnMatchStateOther 3 0
...OnMatchStateOther 4 0
...OnMatchStateOther 5 0
...OnMatchStateOther 6 0
...OnMatchStateOther 7 0
...OnMatchStateOther 8 0
...OnMatchStateOther 9 0
...OnMatchStateOther 10 0
...OnMatchStateOther 11 0
...OnMatchStateOther 12 0
...OnMatchStateOther 13 0
...OnMatchStateOther 14 0
...OnMatchStateOther 15 0
...OnMatchStateOther 16 0
...OnMatchStateOther 17 0
Mapscripts: done setting up objective from match state
Parsed gui 'democharge' in 1 ms
Parsed gui 'democharge' in 0 ms
Parsed gui 'democharge' in 0 ms
defuse vo is playing
WARNING: Bot 8 is stuck
WARNING: Bot 11 is stuck
WARNING: Bot 14 is stuck
WARNING: Bot 15 is stuck
WARNING: Bot 13 is stuck
WARNING: Bot 9 is stuck
WARNING: Bot 12 is stuck
WARNING: Bot 14 is stuck
WARNING: Bot 15 is stuck
WARNING: Bot 13 is stuck
WARNING: Bot 14 is stuck
WARNING: Bot 15 is stuck
WARNING: Bot 13 is stuck
three seconds from now should be vunerable
no longer invun
Triggered Challenge Bonus 'headshots': 9769 Total: 9769 Count: 1
Triggered Challenge Bonus 'headshots': 9769 Total: 19538 Count: 2
Triggered Challenge Bonus 'headshots': 9769 Total: 29307 Count: 3
WARNING: Thread '': sdGameMapScriptState::CallEvent Event Call 'forceDisableClip' on NULL entity
Door 1 Explode
WARNING: Thread '': Already synced stats less than a minute ago - ignoring
Bot action group 2 active
Set Challenge Multiplier to 2
New Score mod
2
WARNING: Thread '': idGameLocal::SetGUIFloat: could not find float property 'gameHud.weaponChargePercent'
WARNING: Enter_NBG_AvoidaDanger without current danger. BotNum:11
WARNING: Thread '': Already synced stats less than a minute ago - ignoring
tracked globals.game.commandPostActivesdAbilityManager::OnLocalPlayerClassChanged: 0
Received abilities from client 0
...'grenade_molotov' set as bind 0
...'landmine' set as bind 8
...'charge' set as bind 16
...'spotting' set as bind 17
...'repairing' set as bind 18
...'disarming' set as bind 19
...'building' set as bind 20
...'revive' set as bind 21
...'hacking' set as bind 22
...'sprinting_reload' set as bind 23
...'hardened_skin' set as bind 24
...'power_maximum_increase' set as bind 25
...'sprinting_grenade' set as bind 26
...'give_ammo' set as bind 56
...'life_buff1' set as bind 57
...'weapon_buff1' set as bind 58
...'disguise_self' set as bind 59
17 abilities set
done setting 17 local abilities
tracked globals.game.commandPostActivetracked globals.game.commandPostActivetracked globals.game.commandPostActiveWARNING: RES1010: Invalid operation - generated/sound/nolocalization/msadpcm/weapons/submachinegun/security/carb9/farmid_s_carb9_part7.msadpcm: skipping
WARNING: RES1010: Invalid operation - generated/sound/nolocalization/msadpcm/weapons/submachinegun/security/carb9/farmid_s_carb9_part8.msadpcm: skipping
WARNING: RES1010: Invalid operation - idDeclMaterial: textures/container_city/crane_ctrls_03_fix: Touched outside of loading sequence
WARNING: RES1010: Invalid operation - idDeclTable: radflicker: Touched outside of loading sequence
WARNING: RES1010: Invalid operation - sdTexture: textures/container_city/crane_ctrls_03_d: Touched outside of loading sequence
Repair objective complete
********************
FATAL ERROR: AllocRenderModel called from a different thread for 'particles/weapons/muzzle_flashes/arifle_light_3rdperson'
********************
...unloading Input Method Editor DLL
mouse: Failed to remove raw input device
...unloading Raw Input DLL

------- Input Initialization -------
Initializing DirectInput8...
...calling LoadLibrary( 'user32.dll' ): succeeded
...initializing Raw Input
mouse: Raw Input initialized.
...calling LoadLibrary( 'imm32.dll' ): succeeded
...initializing Input Method Editor
------------------------------------
AllocRenderModel called from a different thread for 'particles/weapons/muzzle_flashes/arifle_light_3rdperson'
...unloading Input Method Editor DLL
mouse: Failed to remove raw input device
...unloading Raw Input DLL
Shutting down OpenGL subsystem
...releasing DC
...destroying window
...shutting down QGL
...unloading OpenGL DLL
...unloading Windows Terminal Server API DLL

uninstall and then reinstall again?

there are loads of errors in there, or get steam to recheck the game cache. something seems corrupted there.