Needing Technical help Please

[RDDR]

The long and short of it is I had downloaded Service pack three.
Was having problems with slowdowns so decided to reinstall a clean OS.
This was done.
Forgot to uninstall SHIV which was on my D: Slave drive.
Did so after installing a clean windows.
My mistake was because there was no game showing in Control panel I deleted the game in D:
My problem is that when i try to reinstall nothing is showing in my E: DVD Drive.
When I go to properties on the Drive it shows the disc is naturally full.
Looks like installer is gone.
Should i just get a new copy,or is there something that can be done.
I have cleaned my Registry,Nada!!
I have looked for any lingering files in Windows..Nada!