No,tampoco funciona ese.
Me he dado cuenta que tengo dos carpetas windows,de una instalacion anterior :
Windows.0 y Windows
No se si esto genere conflictos,voy a reinicar,de borrar la que no se usa y correr la instalacion.
Edito : Tampoco me deja instalar el 4.0
Aqui dejo el LOG :
OS Version = 5.1.2600, Platform 2, Service Pack 3
OS Description = WinXP - x86 Home Edition Service Pack 3
CommandLine = F:\1229cbc60f5518ff3e3e05\\Setup.exe /x86 /x64 /ia64 /web
TimeZone = Hora estándar del Pacífico
Initial LCID = 2058
Using Simultaneous Download and Install mechanism
Operation: Installing
Package Name = Microsoft .NET Framework 4 Setup
Package Version = 4.0.30319
User Experience Data Collection Policy: UserControlled
Number of applicable items: 8
MSI (C:\DOCUME~1\Gerardo\CONFIG~1\Temp\Microsoft .NET Framework 4 Setup_4.0.30319\netfx_Core_x86.msi) Installation failed. Msi Log: Microsoft .NET Framework 4 Setup_20140119_194602690-MSI_netfx_Core_x86.msi.txt
Final Result: Installation failed with error code: (0x80070643), "Error grave durante la instalación. " (Elapsed time: 0 00:02:12).