.NET Framework 4 is required to run and develop ASP.NET 4.0 sites.
Install .NET Framework 4
The Microsoft .NET Framework 4 web installer package downloads and installs the .NET Framework.
Installation Requirements
Recommended Minimum: Pentium 1 GHz or higher with 512 MB RAM or more
Minimum disk space: 850 MB
Internet Information Services (IIS) version 6.0 or later
Microsoft Data Access Components 2.8 or later
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