I think I can get you going. Since the computer is asking you which language you want, it sounds like the computer has started up from the install CD.
Click next if the keyboard and mouse clicker is working.
The Welcome to the Mac OS X Installer window appears.
Click Continue. The Important Information window appears.
After reading or printing the information, click Continue. The Software License Agreement window appears.
After reading or printing the information, click Continue.
An agreement sheet appears. If you agree with the license agreement, click Agree.
The Select a Destination window appears.
Click the volume that you wish to install to.
Click Options. The installation options sheet appears.
Select Archive and Install.
Select the volume which already has Mac OS X installed.
You should also select Preserve Users and Network Settings, to preserve network and Home directory settings. (See notes and Related documents below.)
Click Continue to begin the installation.
Here is where this information for reinstalling using the Archive & Install feature: