Visual Studio 11 Crashes

I have a funky problem... I installed IIS7 to my development server where I had Visual Studio 11 as well. Then I installed PHP 5.5 and now somehow Visual Studio crashes when I try to load solutions.

What causes that, and how can I fix it?

Some errors:

Faulting application name: devenv.exe, version: 11.0.50727.1, time stamp: 0x5011ecaa Faulting module name: KERNELBASE.dll, version: 6.1.7601.18229, time stamp: 0x51fb1116 Exception code: 0xe0434352 Fault offset: 0x0000c41f Faulting process id: 0x7b8 Faulting application start time: 0x01cecfcb703b640a Faulting application path: C:\Program Files (x86)\Microsoft Visual Studio 11.0\Common7\IDE\devenv.exe Faulting module path: C:\windows\syswow64\KERNELBASE.dll Report Id: b2efd82d-3bbe-11e3-93af-b433428ecf9e

Application: devenv.exe Framework Version: v4.0.30319 Description: The process was terminated due to an unhandled exception. Exception Info: System.ComponentModel.Composition.ImportCardinalityMismatchException Stack: at System.ComponentModel.Composition.Hosting.ExportProvider.GetExports(System.ComponentModel.Composition.Primitives.ImportDefinition, System.ComponentModel.Composition.Hosting.AtomicComposition) at System.ComponentModel.Composition.Hosting.ExportProvider.GetExportsCore(System.Type, System.Type, System.String, System.ComponentModel.Composition.Primitives.ImportCardinality) at System.ComponentModel.Composition.Hosting.ExportProvider.GetExportedValueCore[[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]](System.String, System.ComponentModel.Composition.Primitives.ImportCardinality) at System.ComponentModel.Composition.Hosting.ExportProvider.GetExportedValue[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089] at System.ComponentModel.Composition.Hosting.ExportProvider.GetExportedValue[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089] at Microsoft.VisualStudio.ComponentModelHost.ComponentModel.GetService[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089] at Microsoft.VisualStudio.Progression.CommonIconHelper.Initialize(System.IServiceProvider) at Microsoft.VisualStudio.Progression.LanguageService.CSharp.IconHelper.Initialize(System.IServiceProvider) at Microsoft.VisualStudio.Progression.LanguageService.CSharp.CSLanSvcProvider.InitializeProvider() at Microsoft.VisualStudio.Progression.LanguageService.CSharp.CSLanSvcProvider.EnsureInitialized() at System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate, System.Object, Int32) at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(System.Object, System.Delegate, System.Object, Int32, System.Delegate) at System.Windows.Threading.DispatcherOperation.InvokeImpl() at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(System.Object) at System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean) at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean) at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object) at System.Windows.Threading.DispatcherOperation.Invoke() at System.Windows.Threading.Dispatcher.ProcessQueue() at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr, Int32, IntPtr, IntPtr, Boolean ByRef) at MS.Win32.HwndWrapper.WndProc(IntPtr, Int32, IntPtr, IntPtr, Boolean ByRef) at MS.Win32.HwndSubclass.DispatcherCallbackOperation(System.Object) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate, System.Object, Int32) at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(System.Object, System.Delegate, System.Object, Int32, System.Delegate) at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(System.Windows.Threading.DispatcherPriority, System.TimeSpan, System.Delegate, System.Object, Int32) at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr, Int32, IntPtr, IntPtr)