We need more info on this DVD drive. Is it IDE or SATA? Either way, Windows 7 shouldn't need drivers for either interface.
If you have a USB external DVD drive, that should work without any hassle - just choose USB as a boot option from the BIOS.
If you are trying to run the W7 ISO from a USB stick, you need to format the USB stick in a way that it can be used as system boot drive.
Formatting under windows won't do this for you, and copying the files across won't make it bootable.
Get Microsoft's tool for the job:http://images2.store.microsoft.com/prod ... D-tool.exe