Inspiron One 2305 drive formatted. What options are avaiable for reinstall?

I have a clients computer, Inspiron one 2305, which he installed Ubuntu on after formatting the drive.  He wants to put windows back on it but the restore cd's he made do not function.  Is there a restore cd set he that can be purchased for this machine?  Warranty is expired so email and phone support are out of the question also.

Thanks