Mike6802,   Windows XP needs all versions of .net framework installed. Vista/Windows 7 machines need the current version available from Windows Updates.   Make sure if you're installing the operating system to install the drivers in the correct order. How to Download and Install Drivers in the Correct Order   Some companies use an image to install the system and some of the drivers still do not install properly, so installing the drivers in the correct order helps.     Rick    
We just got in some pallets of OptiPlex 580s with Win7 Pro OEM.  They have .NET Framework 4 Client Profile and Extended pre-installed.  I know little about .NET; will we still need to install all previous versions?  Or would that only be required if we had apps built only for a lower .NET Framework version?
Windows 7 Pro and .NET Framework 4