my windower keeps crashing everytime i try and open
here is my crash report please help
3/3/2014 9:28:57 PM
---------------------------------------------------------------------
System.IO.FileNotFoundException: Could not load file or assembly 'System.Xml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The system cannot find the file specified.
File name: 'System.Xml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'
at #=qV_vdXJWxFe82jBde5nTWZNpU5N6zKCFTkYVR28Q6PJQ=.#=qlBFyaoWn6Lbm7_DC3shqjQ==()
at Launcher.LauncherApplication..ctor(SplashScreen #=qf1N4B_PrqOdTNDSUbsv80w==)
at #=qnTC76DU__og_WMgWCrTYvRcQxL1W079cH4guBwcE_Ec=.#=qFBpVS932WqoZvE_tXrbxgw==()
at #=qPUOOy9u5HdURknzeezer4ma9AtDiJSThgKqArWsT_GU=.#=qt4kp1W4B7EWJTkNhTHr5uA==()
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].
`````````````````````````````````````````````````````````````````````
