I installed sql server 2012 and now i want to install sql server managment studio 2012. during installation it is required to have installed .NET 3.5 sp1. I enabled .NET 3.5 in my control panel, but it is not ok. I tried to download and install .NET 3.5 sp1, but I failed. I have windows 7. Anybody knows what's the problem?
Take a look at this page: http://msdn.microsoft.com/en-us/library/ms143506(v=sql.110).aspx . As QuentinL suggested, install SP1 for windows 7 - that will add .net 3.51. Also, depending on the edition of SQL server you are installing there are requirments on the edition of Windows 7 as well, which is also listed on that page.