Im trying to download .net framework 4.0 on my windows xp pc and get error with 16 bit ms dos subsys

[Trips]

Im testing my application and i want to check if i dont have .net 4.0 installed so the setup will automatic detect it and will download if needed.
In my windows 7 system its working but on my mini laptop with windows xp pro its not working.
Its detecting that i need to install it and its going to the downloading site and start to download the file wich is 48mb and after second or two i see black small window of the ms dos and small window inside with error:
16 bit ms-dos subsystem
C:..............dotnetfx.exe The NTVDM CPU has encountered an illegal instruction CS:053a IP: 02e8 OP:63 61 2d 31 31 choose close.

I tried to download a fix for it while google for a solution but it didnt work.
What could be the problem and how to fix it?
Im using inno 5 setup and im using this script for it and on windows 7 its working:

[_ISTool]<br/>
EnableISX=true
[Setup]<br/>
AppName=MyApp<br/>
AppVerName=MyApp 1.0.0<br/>
MinVersion=4.1,4.0<br/>
DefaultDirName=d:mydefdir<br/>
DefaultGroupName=MyApp<br/>
UninstallDisplayIcon={app}MyApp.exe<br/>
Compression=lzma<br/>
SolidCompression=true<br/>
OutputBaseFilename=MyAppSetup
[Files]<br/>
Source: Crogram Files (x86)ISToolisxdl.dll; Flags: dontcopy
<br/>
[Messages]<br/>
WinVersionTooLowError=MyApp requires Windows NT4, Windows 98 or later.
[Icons]<br/>
Name: {group}MyApp; Filename: {app}MyApp.exe<br/>
Name: {group}Uninstall MyApp; Filename: {uninstallexe}

<br/>
var<br/>
  dotnetRedistPath: string;<br/>
  downloadNeeded: boolean;<br/>
  dotNetNeeded: boolean;<br/>
  memoDependenciesNeeded: string; 
 procedure isxdl_AddFile(URL, Filename: PChar);<br/>
external  mailto:isxdl_AddFile@files:isxdl.dll isxdl_AddFile@files:isxdl.dll  stdcall;<br/>
function isxdl_DownloadFiles(hWnd: Integer): Integer;<br/>
external  mailto:isxdl_DownloadFiles@files:isxdl.dll isxdl_DownloadFiles@files:isxdl.dll  stdcall;<br/>
function isxdl_SetOption(Option, Value: PChar): Integer;<br/>
external  mailto:isxdl_SetOption@files:isxdl.dll isxdl_SetOption@files:isxdl.dll  stdcall; 
 <br/>
const<br/>
  dotnetRedistURL = http://www.microsoft.com/downloads/en/details.aspx?FamilyID=0a391abd-25c1-4fc0-919f-b21f31ab88b7&displaylang=en;<br/>
  // local system for testing... <br/>
  // dotnetRedistURL = http://192.168.1.1/dotnetfx.exe; 
 function InitializeSetup(): Boolean; 
 begin<br/>
  Result := true;<br/>
  dotNetNeeded := false; 
   // Check for required netfx installation<br/>
  if (not RegKeyExists(HKLM, SOFTWAREMicrosoft.NETFrameworkv4)) then begin<br/>
    dotNetNeeded := true;<br/>
    if (not IsAdminLoggedOn()) then begin<br/>
      MsgBox(MyApp needs the Microsoft .NET Framework to be installed by an Administrator, mbInformation, MB_OK);<br/>
      Result := false;<br/>
    end else begin<br/>
      memoDependenciesNeeded := memoDependenciesNeeded +       .NET Framework #13;<br/>
      dotnetRedistPath := ExpandConstant({src}dotnetfx.exe);<br/>
      if not FileExists(dotnetRedistPath) then begin<br/>
        dotnetRedistPath := ExpandConstant({tmp}dotnetfx.exe);<br/>
        if not FileExists(dotnetRedistPath) then begin<br/>
          isxdl_AddFile(dotnetRedistURL, dotnetRedistPath);<br/>
          downloadNeeded := true;<br/>
        end;<br/>
      end;<br/>
      SetIniString(install, dotnetRedist, dotnetRedistPath, ExpandConstant({tmp}dep.ini));<br/>
    end;<br/>
  end; 
 end; 
 function NextButtonClick(CurPage: Integer): Boolean;<br/>
var<br/>
  hWnd: Integer;<br/>
  ResultCode: Integer; 
 begin<br/>
  Result := true; 
   if CurPage = wpReady then begin 
     hWnd := StrToInt(ExpandConstant({wizardhwnd})); 
     // dont try to init isxdl if its not needed because it will error on < ie 3<br/>
    if downloadNeeded then begin 
       isxdl_SetOption(label, Downloading Microsoft .NET Framework);<br/>
      isxdl_SetOption(description, MyApp needs to install the Microsoft .NET Framework. Please wait while Setup is downloading extra files to your computer.);<br/>
      if isxdl_DownloadFiles(hWnd) = 0 then Result := false;<br/>
    end;<br/>
    if (Result = true) and (dotNetNeeded = true) then begin<br/>
      if Exec(ExpandConstant(dotnetRedistPath), , , SW_SHOW, ewWaitUntilTerminated, ResultCode) then begin<br/>
         // handle success if necessary; ResultCode contains the exit code<br/>
         if not (ResultCode = 0) then begin<br/>
           Result := false;<br/>
         end;<br/>
      end else begin<br/>
         // handle failure if necessary; ResultCode contains the error code<br/>
         Result := false;<br/>
      end;<br/>
    end;<br/>
  end;<br/>
end; 
 function UpdateReadyMemo(Space, NewLine, MemoUserInfoInfo, MemoDirInfo, MemoTypeInfo, MemoComponentsInfo, MemoGroupInfo, MemoTasksInfo: String): String;<br/>
var<br/>
  s: string; 
 begin<br/>
  if memoDependenciesNeeded <>  then s := s + Dependencies to install: + NewLine + memoDependenciesNeeded + NewLine;<br/>
  s := s + MemoDirInfo + NewLine + NewLine; 
   Result := s<br/>
end; 
   
 Another thing is where can i find a direct link to download the .net 4.0 exe file wich is 48mb or so? Cuz i want it to be downloaded automatic for now i could make so it will download only the installer of the .net 4.0 but i want it to download the big file. 
   
 Thanks for help. 
   
   
   <hr class="sig danieli

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