Hello All ! I can't install .net 4.5 on Server 2008 R2 sp1 enterprise or datacenter but i can install .net 3.5 this is my error i uploaded on photobucket.com http://i11.photobucket.com/albums/a165/phuongla83/Net45png.png Can't install .net 4.5 from web or download full packet from microsoft. When i run it i open task manager i see it run in process this is photo http://i11.photobucket.com/albums/a165/phuongla83/Untitled-1.png i clean install new OS and update the laste windows hotfix but can't install .net 4.0 too this is photo http://i11.photobucket.com/albums/a165/phuongla83/Net40png.png Installation Failure: Windows failed to install the following update with error 0x80070050: Microsoft .NET Framework 4 for Windows Server 2008 R2 x64-based Systems (KB982671). Thanks for read !

I will suggest you to post your query here. http://social.msdn.microsoft.com/Forums/en-us/netfxsetup/threads Thanks