Well, I surely need it again !
I chose custom ( upgrade wasn't even an option ) and selected the old partition.
I was after the *9 in Clean Install Windows 7
=General%20Tips but restarting, instead of continuing with the installation, has restarted the startup recovery. The next time I wanted to retry it and then choose to boot from the disk after the restart of the *9, but the *9 doesn't even arrive! ( file corrupted just after pressing next )
Now I'm thinking of choosing format or delete in *8 ( don't know the difference ), but maybe the problem is more complicated.
The scandisk would take about 8 hours, so I won't do it now.
Maybe should I tell how the problem is started?
The PC has 2HD in RAID1 ( settled before an O.S. was installed, so I think in the motherboard ). After a power loss the RAID was gone, but I was working on one HD like before the power loss. Then I re-settled the RAID in bios, and instead of Windows has appeared a black screen with many 'fixing problem', I think it was a scandisk; and then started the startup-recovery ( always restarting the pc ).
So before resetting the RAID in bios it worked, and I tried ( although don't know if done correctly ) to start only with one HD ( disabling the other from bios, because I don't know how to do it manually on the hardware ), and I've tried this with both of them, but startup-recovery was always there, restarting the pc.