UT2004 Build UT2004_Patch_[2004-06-11_16.51]

OS: Windows XP 5.1 (Build: 2600)
CPU: AuthenticAMD PentiumPro-class processor @ 1654 MHz with 511MB RAM
Video: ASUS AGP-V7700 DDR SGRAM V56.55 (5655)

FloatProperty XWeapons.Grenade.ExplodeTimer: Serial size mismatch: Got 16, Expected 17

History: LoadObject <- (FloatProperty XWeapons.Grenade.ExplodeTimer 99856==99856/660416 99840 17) <- ULinkerLoad:reload <- LinkProperties <- UStruct::Link <- UState::Link <- UClass::Link <- UStruct::Serialize <- (Class XWeapons.Grenade) <- UState::Serialize <- UClass::Serialize <- (Class XWeapons.Grenade) <- LoadObject <- (Class XWeapons.Grenade 99856==99856/660416 59843 415) <- ULinkerLoad:reload <- PreLoadObjects <- UObject::EndLoad <- UObject::StaticLoadObject <- (Engine.Level None.MyLevel AlienSwarmStartup.ut2) <- LoadLevel <- UGameEngine::LoadMap <- LocalMapURL <- UGameEngine::Browse <- UGameEngine::Init <- InitEngine <- FMallocWindows::Free <- FMallocWindows::Free



This is when I start Alien Swarm from UT2K4...
When I try to start it independently, I get a Runtime error...


I patched to 3236 and tried deleting AlienSwarm.ini


Someone please help!!!