IronPython 2.7/ 2.6 for .Net4 Install Error

I am gettting some really annoying errors while attempting to install IronPython so I can work with .Net4 assemblies.

I have tried both the .Net4 compatible installer versions of IronPython and both give me an error. The 2.7 one says it has had a problem installing assembly error code 2908. The 2.6 for .Net4 installer just says it has encountered an error and rolls back.

I have IronPy开发者_开发知识库thon2.6 installed and working fine. But I need the .Net4 upgrade, I am running Win7 x64. Think maybe the OS configuration might be at fault? I realise this isn't a straight programming question, but I was hoping some of the SO community might be able to shed some light on this one, where my Google bashing has not.

If you don't need it to be installed, you can use the .zip package to get the files. The only thing the installer really does is add the assemblies to the GAC.