Posted by: Ian | December 1, 2009

Installing .Net 3.5 after a previous install fails

I’ve been building a 2008 Server base image in preparation for SQL 2008 and as part of the install .Net 3.5 is needed. Unfortunately first time round the server crashed mid way through the install. Any attempt after that failed to install or remove .Net 3.5.

So after a bit of digging around here’s what I did to get it all working again:

  • Clear out the %Temp% dir
  • Delete the following Reg keys
  • HKEY_LOCAL_MACHINESOFTWAREMicrosoftNET Framework Setup
  • HKEY_LOCAL_MACHINESOFTWAREMicrosoftNET Framework SetupNDPv2.0.50727
  • HKEY_LOCAL_MACHINESOFTWAREMicrosoftNET Framework SetupNDPv3.0
  • HKEY_LOCAL_MACHINESOFTWAREMicrosoftNET Framework SetupNDPv3.5
  • Install .NET framework 3.0 from Role Management tool on the box.
  • Computer Management -> Features -> Add features ->.NET framework 3.0 framework
  • Then install .NET framework 3.5
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