Engine Error class name missing from entity!

[halo2fan120]

Ok i just got the game through steam and it ran ok with some fas and some slow loading times and during some fights the fps dropped alot but when i got to chapter 2 or 3 (i forget which but its the 1 after u meet that guy and his niece) and it loads the chapter about 60% then i get the error Engine Error class name missing from entity!

I have no idea what this means...if anyone could help me i would be very grateful.

==System==

Operating System: Windows Vista Ulitame (6.0, Build 6000)
Processor: Intel(R) Pentium(R) 4 CPU 3.40GHz (2 CPUs) ~3.4GHz
Memory: 1534MB RAM
Page File: 1132MB used, 2175MB available
DirectX Version: DirectX 10

==Display==

Name: RADEON x550 (Microsoft Corporation - WDDM)
Manufacturer: ATI Technologies Inc.
Chip Type: N/A
Approx. Total Memory: 766

==Sound==

Name: Speakers (Realtek High Definition Audio)

[Blín D'ñero]

Hi halo2fan120.
"Errors" that you read in the console are irrelevant as to why your PC crashes at that point in game. To get a picture of the status of your PC so i could assist you a full dxdiag report is required, so
please post your dxdiag using the scroll button!

Alternatively you might solve it yourself by consulting the Dark Messiah of Might & Magic Troubleshooting Guide thread.