Linux by default uses Ext (Extended File System http://en.wikipedia.org/wiki/Extended_file_system) as its way to store files on the computer, this is NOT readable by Windows. By just clicking NEXT and doing the install you inadvertently informed the computer to store files as Ext, and probably in the processes WIPED OUT Windows, and all the files you had on the computer (if your repeated questioning is to just 'recover back to the way it was, you can't). The further problem is, if you just installed the Windows DVD to reinstall you probably be told there is NO SPACE on the drive / only recover a very small part of your drive for Windows and the rest unusable because it is only accessible by a Linux based OS.
Hence, back again to my instructions would be easiest. Download Ubuntux and make a boot DVD with it. Boot with it, then delete all sectors / drives. Reboot and insert the Windows DVD, it will see the drive completely empty (like it is brand new) and want to format and setup windows. Then have funw ith drivers, programs etc. reinstall.