Windows 7 - How to copy and paste protected & in-use system files?

Question
I would like to attempt to copy an untouched .NET 2.0 directory from a second PC here at home (identical install of Windows) but when I try there are files in use by the system and some say they can't be copied because they are protected system files. Is there any way that I can accomplish this, both copying the .NET 2.0 directory from another PC, and copying it in its entirety to this PC? I assume this would have to be done outside of Windows but have no idea how to do this. Can anybody help me?

If You're Curious, This Is Why I'm Asking
A while ago I had a mishap and some system files in the Windows directory were deleted. I was able to restore everything, or so I thought, without any issues. Windows has been operating, without issue, for well over six months now, with the exception of Microsoft Framework .NET 2.0. Any app coded for .NET 2.0 crashes when I try to start it (no error code). The registry was not affected during that fiasco so I assume all .NET 2.0 registry entries are completely intact.

Note: I have extensively researched repairing, reinstalling, and replacing the .NET 2.0 installation. I have tried every official and unofficial tool that I could find. Unfortunately, all tools only affect .NET installations you installed to the system. Given that 2.0 is a part of Windows 7, I am unable to fix this using any normal means. If I wish to have a working .NET 2.0 I need to perform a clean install. This is the last possible thing I can try, as far as I know.

 

I guess you could boot the computer in question in linux, then use samba to copy the files to windows. :confused

 

It would be futile. .NET 2.0 not only creates many new files on the system but also makes significant changes to the registry. The answer to your problem would surely be simply to download and reinstall it. If you google download .NET 2.0 you will get many options.