swalker wrote:

I recall that when you insert a WIN7 CD into the CD drive of a machine
that already has Win 7 installed that you have the option of either a
clean install or a repair.

My question is, if you choose repair what does the repair overwrite?

What user data is lost?

In theory, nothing.

"The Startup Repair tool repairs Windows 7 by replacing important operating
system files that might be damaged or missing."

Google "windows 7 repair" for some relevant info.

--
As they did in 2000, software will spectacularly crash, hardware
will explode, appliances will go haywire and attack their owners,
and nuclear missiles will simultaneous launch and destroy the world.