Windows 7: Update W7 RC

How I can update Windows 7 RC 7100 to new version(mybe 7261) without reinstal programs?

the latest x86 version is build 7260, you can try upgrading by just inserting the DVD or mounting the ISO file using something like MagicISO and running setup. but chances the upgrade will fail because of the way the ISO file was created using older setup files, it is also recomended to do a clean install from the previews builds. you can do a clean install without formating too, which keeps your data, and just moves the old windows directory to windows.old to use the windows directory for the new installation, hope this helps

How do you do that?

I believe if you do a clean install from within the OS, it just makes a Windows.old folder in C:/

Oh, I thought you could only do upgrades from within the OS. I only do clean installs with formatting when I install OS's these days.

Thats how I do it as well. =P

It's the other way round, install from boot and chose your existing Windows 7 partition and install without formatting and it will then give you the Windows.old folder.

Oopsies, my bad. It is located in the C:/ dir after clean install right?

I did a clean install and selected my system parition for the old installation ( C:\ Drive) and it moved the old windows into windows.old directory, here is a screen shot attached that shows the location of the directory, no format was neccessary

The same in my case.
You can use data from Windows.old, but have to reinstall all programs working in Windows.