We have an asp.net MVC app using Fluent Nhibernate running on top of IIS7 & Windows Sever 2008. Frequently (although so far we have yet to consistently reproduce it) after a build we get a yellow screen of death with this exception: 

[COMException (0x800703fa): Illegal operation attempted on a registry key that has been marked for deletion. (Exception from HRESULT: 0x800703FA)]
   System.Reflection.Assembly._nDefineDynamicModule(Assembly containingAssembly, Boolean emitSymbolInfo, String filename, StackCrawlMark& stackMark) +0
   System.Reflection.Emit.AssemblyBuilder.DefineDynamicModuleInternalNoLock(String name, Boolean emitSymbolInfo, StackCrawlMark& stackMark) +381
   System.Reflection.Emit.AssemblyBuilder.DefineDynamicModuleInternal(String name, Boolean emitSymbolInfo, StackCrawlMark& stackMark) +105
   System.Reflection.Emit.AssemblyBuilder.DefineDynamicModule(String name, Boolean emitSymbolInfo) +83
   Castle.DynamicProxy.ModuleScope.CreateModule(Boolean signStrongName) +206
   Castle.DynamicProxy.ModuleScope.ObtainDynamicModuleWithWeakName() +63
   Castle.DynamicProxy.Generators.Emitters.ClassEmitter.CreateTypeBuilder(ModuleScope modulescope, String name, Type baseType, Type[] interfaces, TypeAttributes flags, Boolean forceUnsigned) +78
   Castle.DynamicProxy.Generators.Emitters.ClassEmitter..ctor(ModuleScope modulescope, String name, Type baseType, Type[] interfaces, TypeAttributes flags, Boolean forceUnsigned) +69
   Castle.DynamicProxy.Generators.Emitters.ClassEmitter..ctor(ModuleScope modulescope, String name, Type baseType, Type[] interfaces) +36
   Castle.DynamicProxy.Generators.BaseProxyGenerator.BuildClassEmitter(String typeName, Type parentType, Type[] interfaces) +140
   Castle.DynamicProxy.Generators.ClassProxyGenerator.GenerateCode(Type[] interfaces, ProxyGenerationOptions options) +648
   Castle.DynamicProxy.ProxyGenerator.CreateClassProxy(Type classToProxy, Type[] additionalInterfacesToProxy, ProxyGenerationOp
nhibernate iis-7
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