Can not put printer back on computer, someone please help

I have the same problem.  I have a dell 942 All-in-one.  When I tried to reinstall thru the disk, it would say replace disk in disk drive.  It would be just as though there wasn't a disk in the drive.  In the end I gave up & downloaded from dell site which took over 2 hours, but now I cant get into the printer via Start/Program/

Dell printers/Dell Photo Aio 942 .  The computer gets into a loop saying Preparing Dell All-in-one Center for first use.  Searching for scanning application.  Please Wait.

I can scan, print etc but can't get thru to the All in one center. 

 

Can anyone help me out as well???