MOSS and WSS 3.0 Installation on Windows Server 2008 R2

If you want to install SharePoint 2007 on Windows Server 2008 R2, you need to take special actions because SP2, which supports this operation, is a prerequisite. If you try to install with SP1 you will receive an error message.

The way to do this is to use a slipstream, something like concatenating several components together to meet the requirements.

In its Team Blog, Microsoft published  KB articles explaining the needed steps.

The slipstream builds can be found here:

Windows SharePoint Services 3.0 with SP2 (x86) http://www.microsoft.com/downloads/details.aspx?FamilyId=EF93E453-75F1-45DF-8C6F-4565E8549C2A&displaylang=en
Windows SharePoint Services 3.0 with SP2 (x64) http://www.microsoft.com/downloads/details.aspx?familyid=9FB41E51-CB03-4B47-B89A-396786492CBA&displaylang=en
For SharePoint Server 2007, you can follow Create an installation source that includes software updates (Office SharePoint Server 2007) to create one. Or you can also read on. We will go through the complete steps to create a new slipstream build for SharePoint Server 2007.

You can find the article here:
http://blogs.msdn.com/sharepoint/archive/2009/10/02/install-sharepoint-server-2007-on-windows-server-2008-r2.aspx

And one more tip: If this is a plain vanilla installation, and you have control over the server type, you need to use the X64. SharePoint 2010 will work on X64 only.