If you are the original owner and live in US, you can request a set of original disks HERE. 
Hi, Does anybody out there have a copy of the restore disks for the Inspiron 1545 that they can copy and send to me?? I ask as my laptop has failed and I stupidly din`t make these disks and am unable to use the restore partition. I do not mind paying for this service. I look forward to hearing from somebody!!
Restore disks for Inspiron 1545