You might not need a disk.
I saw the MiniToolBox report you posted in your topic here http://www.bleepingcomputer.com/forums/t/540554/desperate/?p=3427482
MTB lists the following
1 Drive c: () (Fixed) (Total:919.56 GB) (Free:551.13 GB) NTFS
2 Drive d: (Windows Registry) (CDROM) (Total:0.54 GB) (Free:0.41 GB) UDF
3 Drive e: (Respawn Recovery) (Fixed) (Total:11.95 GB) (Free:11.83 GB) NTFS
Drive e: is the recovery drive, which takes the place of install disks. You should be able to to use the recovery drive to set the system back to factory state.
Read this page for more information http://www.dell.com/support/troubleshooting/us/en/19/KCS/KcsArticles/ArticleView?docid=540734
The page refers to Windows 7 but may be the same as or similar to Vista.
If you reinstall, please go to your AII topic and say you did that so it can be closed.
Edited by Queen-Evie, 22 July 2014 - 10:15 AM.