.NET Framework Versions in Registry

.NET 1.0: Software\\Microsoft\\.NETFramework\\Policy\\v1.0

.NET 1.0: SP1 Software\\Microsoft\\Active Setup\\Installed Components\\{78705f0d-e8db-4b2d-8193-982bdda15ecd}

.NET 1.0: SP2 Software\\Microsoft\\Active Setup\\Installed Components\\{FDC11A6F-17D1-48f9-9EA3-9051954BAA24}

.NET 1.1: Software\\Microsoft\\NET Framework Setup\\NDP\\v1.1.4322

.NET 2.0: Software\\Microsoft\\NET Framework Setup\\NDP\\v2.0.50727 (Version: 2.0.50727.1434)

.NET 3.0: Software\\Microsoft\\NET Framework Setup\\NDP\\v3.0\\Setup

.NET 3.0 SP: Software\\Microsoft\\NET Framework Setup\\NDP\\v3.0 (Version 3.0.04506.648)

.NET 3.5: Software\\Microsoft\\NET Framework Setup\\NDP\\v3.5 (Version 3.5.21022.08)