195974 experienced .NET man for help2

I need experienced .NET man for help me fix these 3 installation/startup problems on my Visual Studio 2008 on my VISTA: [login to view URL] [login to view URL] [login to view URL] and blank application with ReportViewer say error: Error 1 The type '[login to view URL]' exists in both 'c:\Windows\assembly\GAC_MSIL\[login to view URL]\9.0.0.0__b03f5f7f11d50a3a\[login to view URL]' and 'c:\Windows\assembly\GAC_MSIL\[login to view URL]\8.0.0.0__b03f5f7f11d50a3a\[login to view URL]' D:\2\reportsample\[login to view URL] 1 1 D:\2\reportsample\ Error 2 The type '[login to view URL]' exists in both 'c:\Windows\assembly\GAC_MSIL\[login to view URL]\9.0.0.0__b03f5f7f11d50a3a\[login to view URL]' and 'c:\Windows\assembly\GAC_MSIL\[login to view URL]\8.0.0.0__b03f5f7f11d50a3a\[login to view URL]' c:\Users\GP\AppData\Local\Temp\Temporary ASP.NET Files\reportsample\c24b0f6a\7703bac7\[login to view URL] 252 Error 3 The type '[login to view URL]' exists in both 'c:\Windows\assembly\GAC_MSIL\[login to view URL]\9.0.0.0__b03f5f7f11d50a3a\[login to view URL]' and 'c:\Windows\assembly\GAC_MSIL\[login to view URL]\8.0.0.0__b03f5f7f11d50a3a\[login to view URL]' c:\Users\GP\AppData\Local\Temp\Temporary ASP.NET Files\reportsample\c24b0f6a\7703bac7\[login to view URL] 262 You must connect with VNC to my PC.. and i wish learn what was be wrong.. pls. only enough experienced mans (I am sick trying in meantime :-) and it is experienced .NET man for help2 because on experienced .NET man for help selected man disappear) and who can start right now!