AccessViolationException was unhandled

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.NET

Hi,
I was trying to Start a diadem instance using a VC dll from my vb .net code. I'm getting the following error.

**System.AccessViolationException was unhandled 
  Message="Attempted to read or write protected memory. This is often an indication that other memory is corrupt." 
  Source="SDAS" 
  StackTrace: 
      at SDAS.SDAS.Program.InvokeDIAdemUsingDLL(String sParamTestNo) in C:\Projects\SDAS\Program.vb:line 588     
      at SDAS.SDAS.Program.MonitorPath() in C:\Projects\SDAS\Program.vb:line 267 
      at SDAS.SDAS.Program.Main() in C:\Projects\SDAS\Program.vb:line 125 
      at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args) 
      at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) 
      at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() 
      at System.Threading.ThreadHelper.ThreadStart_Context(Object state) 
      at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) 
      at System.Threading.ThreadHelper.ThreadStart() 
  InnerException:** 

Also, to add this code was working fine in Windows XP. Now my OS has upgraded to WIndows 7.
.NET development is being done with VS2008.

I'm running the application as Administrator. Kindly help me to sort this .

With regards Snake