Server Error in '/dnn' Application.

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WRN: Assembly binding logging is turned OFF. To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1. Note: There is some performance penalty associated with
assembly bind failure logging. To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog]. 

[FileLoadException: Could not load file or assembly 'System.Web.Extensions' or one of its dependencies.
ccess is denied.] [FileLoadException: Could not load file or assembly 'System.Web.Extensions, Version=3.5.0.0,
Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. Access is denied.]
System.Reflection.Assembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly
locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection) +0
System.Reflection.Assembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly
locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection) +43
System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Evidence assemblySecurity,
StackCrawlMark& stackMark, Boolean forIntrospection) +127 System.Reflection.Assembly.
InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)
 +142 System.Reflection.Assembly.Load(String assemblyString) +28
System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) +46
[ConfigurationErrorsException: Could not load file or assembly 'System.Web.Extensions, Version=3.5.0.0,
Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. Access is denied.]
System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) +613 
ystem.Web.Configuration.CompilationSection.LoadAllAssembliesFromAppDomainBinDirectory() +203 
System.Web.Configuration.CompilationSection.LoadAssembly(AssemblyInfo ai) +105
System.Web.Compilation.BuildManager.GetReferencedAssemblies(CompilationSection compConfig) +178
System.Web.Compilation.BuildProvidersCompiler..ctor(VirtualPath configPath, Boolean supportLocalization, 
tring outputAssemblyName) +54 System.Web.Compilation.CodeDirectoryCompiler.GetCodeDirectoryAssembly(VirtualPath virtualDir,
CodeDirectoryType dirType, String assemblyName, StringSet excludedSubdirectories, Boolean isDirectoryAllowed) +600
System.Web.Compilation.BuildManager.CompileCodeDirectory(VirtualPath virtualDir, CodeDirectoryType dirType,
String assemblyName, StringSet excludedSubdirectories) +125 System.Web.Compilation.BuildManager.CompileResourcesDirectory() +31
System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled() +304 [HttpException (0x80004005): Could not
load file or assembly 'System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'
or one of its dependencies. Access is denied.] System.Web.Compilation.BuildManager.ReportTopLevelCompilationException() +58
System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled() +512
System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost,
IConfigMapPathFactory configMapPathFactory, HostingEnvironmentParameters hostingParameters) +729
[HttpException (0x80004005): Could not load file or assembly 'System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'
or one of its dependencies. Access is denied.] System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +8897659
System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +85
System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +333