Ahhh, Nope, I been resourcing the matter more carefully...
we should be able to load on one drive; install to or even upgrade to C:\ from E:\ win7 program
in this case; we installed twice; once on E:\ and once on C:\
as MSFT won't do it for us; we use E:\ as the source for keeping our SFC C:\ clean and free from errors.
we don't always need/have/lose the install disks handy when we have installed from the hard drive; so fixing the SFC issues are non existent otherwise unless we run combofix;
after we install win7 to "E:\" we have a clean copy of windows; therefore running SFC against that directy should clean up the boot drive c:\ in this case
command example would be able to from c:\ SFC /scannow\ /offwin=c:\ /offwinload=e:\
so yes, it should be able work just fines if we know the rightr command to give;
and, we might have interest to update to ten if we had the same pop up message on our screen as we do with win 7 in vista MSFT
but, not likely...