cannot install autocad 2013

[W.Chan]

is the message that comes up alongside it. what seems to be the problem with the installation?

2014/2/18:14:48:31 Wazza WAZZA === Setup started on WAZZA by Wazza ===
2014/2/18:14:48:31 Wazza WAZZA Launch
2014/2/18:14:48:31 Wazza WAZZA CommandLine /url "http://trial.autodesk.com/SWDLDDLM/2013/ACD/WI/AutoCAD_2013_English_Win_32_64bit_wi_en-US_Setup1.exe... /SN 900-45186749 /PK 001E1 /student /akamai /auth authparam /sid SESSION_ID
2014/2/18:14:49:29 Wazza WAZZA === Setup ended ===

2014/2/18:14:48:32 Wazza WAZZA === Setup started on WAZZA by Wazza ===
2014/2/18:14:48:32 Wazza WAZZA Launch
2014/2/18:14:48:33 Wazza WAZZA Download Play SETUP_CONFIG http://trial.autodesk.com/SWDLDDLM/2013/ACD/WI/{A3548B2A-019B-4D04-AB06-D97A758ED489}/SETUP_x64.tar....
2014/2/18:14:49:29 Wazza WAZZA Download Complete SETUP_CONFIG http://trial.autodesk.com/SWDLDDLM/2013/ACD/WI/{A3548B2A-019B-4D04-AB06-D97A758ED489}/SETUP_x64.tar....
2014/2/18:14:49:29 Wazza WAZZA PageOpen LaunchDialog
2014/2/18:14:49:35 Wazza WAZZA PageOpen LicenseDialog
2014/2/18:14:49:35 Wazza WAZZA PageOpen ProductSelectionDialog2
2014/2/18:14:49:40 Wazza WAZZA PageOpen LicenseDialog
2014/2/18:14:49:40 Wazza WAZZA PageOpen LaunchDialog
2014/2/18:14:49:48 Wazza WAZZA PageOpen LicenseDialog
2014/2/18:14:49:52 Wazza WAZZA PageOpen ProductInfoDialog
2014/2/18:14:49:52 Wazza WAZZA PageOpen ProductSelectionDialog2
2014/2/18:14:49:55 Wazza WAZZA PageOpen FullProgressDialog
2014/2/18:14:49:55 Wazza WAZZA Download Play DOTNET4LANG http://trial.autodesk.com/SWDLDDLM/2013/ACD/WI/{A3548B2A-019B-4D04-AB06-D97A758ED489}/DOTNET4KB24688...
2014/2/18:14:51:12 Wazza WAZZA Download Complete DOTNET4LANG http://trial.autodesk.com/SWDLDDLM/2013/ACD/WI/{A3548B2A-019B-4D04-AB06-D97A758ED489}/DOTNET4KB24688...
2014/2/18:14:51:12 Wazza WAZZA Installing .NET Framework Runtime 4.0 Language Pack: C:\Autodesk\WI\AutoCAD 2013\3rdParty\NET\4\wcu\dotNetFramework\dotNetFx40LP_Full_x86_x64_1041.exe /q
2014/2/18:14:51:19 Wazza WAZZA Install .NET Framework Runtime 4.0 Language Pack Failed Installation aborted, Result=1603
2014/2/18:14:51:19 Wazza WAZZA PageOpen InstallCompleteDialog
2014/2/18:14:57:43 Wazza WAZZA === Setup ended ===

2014/2/19:12:11:08 Wazza WAZZA === Setup started on WAZZA by Wazza ===
2014/2/19:12:11:08 Wazza WAZZA Launch
2014/2/19:12:11:08 Wazza WAZZA CommandLine /url "http://trial.autodesk.com/SWDLDDLM/2013/ACD/WI/AutoCAD_2013_English_Win_32_64bit_wi_en-US_Setup1.exe... /SN 900-45186749 /PK 001E1 /student /akamai /auth authparam /sid SESSION_ID
2014/2/19:12:11:13 Wazza WAZZA === Setup ended ===

2014/2/19:12:11:10 Wazza WAZZA === Setup started on WAZZA by Wazza ===
2014/2/19:12:11:10 Wazza WAZZA Launch
2014/2/19:12:11:11 Wazza WAZZA Download Skipped SETUP_CONFIG http://trial.autodesk.com/SWDLDDLM/2013/ACD/WI/{A3548B2A-019B-4D04-AB06-D97A758ED489}/SETUP_x64.tar....
2014/2/19:12:11:13 Wazza WAZZA PageOpen LaunchDialog
2014/2/19:12:12:57 Wazza WAZZA PageOpen LicenseDialog
2014/2/19:12:13:01 Wazza WAZZA PageOpen ProductInfoDialog
2014/2/19:12:13:01 Wazza WAZZA PageOpen ProductSelectionDialog2
2014/2/19:12:13:03 Wazza WAZZA PageOpen FullProgressDialog
2014/2/19:12:13:03 Wazza WAZZA Download Skipped DOTNET4LANG http://trial.autodesk.com/SWDLDDLM/2013/ACD/WI/{A3548B2A-019B-4D04-AB06-D97A758ED489}/DOTNET4KB24688...
2014/2/19:12:13:04 Wazza WAZZA Installing .NET Framework Runtime 4.0 Language Pack: C:\Autodesk\WI\AutoCAD 2013\3rdParty\NET\4\wcu\dotNetFramework\dotNetFx40LP_Full_x86_x64_1041.exe /q
2014/2/19:12:13:10 Wazza WAZZA Install .NET Framework Runtime 4.0 Language Pack Failed Installation aborted, Result=1603

[pendean]

Search the Installation forum for 1603 Errors: http://forums.autodesk.com/t5/Installation-Licensing/bd-p/24

Most likely you will need to remove all instances of .NET on your PC, restart it, install AutoCAD then use Windows Update to put back .NET versions needed on your system.