SDR# wont start and closes program

[tbrady]

ld not load file or assembly 'System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The system cannot find the file specified.
at SDRSharp.ZoomFFT.IFProcessor.set_SampleRate(Double value)
at SDRSharp.Radio.HookManager.SetSampleRate(List`1 processors, Double sampleRate)
at SDRSharp.Radio.HookManager.SetProcessorSampleRate(ProcessorType processorType, Double sampleRate)
at SDRSharp.Radio.Vfo.ConfigureHookSampleRates()
at SDRSharp.Radio.Vfo.Configure()
at SDRSharp.Radio.Vfo.ProcessBuffer(Complex* iqBuffer, Single* audioBuffer, Int32 length)
at SDRSharp.MainForm.ProcessBuffer(Complex* iqBuffer, Single* audioBuffer, Int32 length)
at SDRSharp.Radio.StreamControl.ProcessIQ()
at SDRSharp.Radio.StreamControl.DSPProc()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart() How can I fix this so I can run SDR # on my computer?