If it is a "recovery" disk I wouldn't use it at all. By recovery I mean the ones that just transfer a system image back to the hard drive. The ones that restore to a factory state. If you do actually get it to work it will install all the Dell drivers and bloatware. Not a good thing. If its Dell OEM branded install media, an actual modified Windows 7 install DVD it might work. Those disks use SLP, to look for a SLIC table in the BIOS. If the SLIC table is there and its the correct one, you don't get asked for a product code and activation is automatic. The DISK is tied to the PC's BIOS. If the SLIC table isn't there, or isn't the correct one, you might get lucky and it will just ask you for your product code. It may also just refuse to install and kick you back out. If its a "recovery" disk "set" I wouldn't even bother trying it. If its a modified Windows 7 DVD there should be a sources folder with an $OEM$ folder in it. The $OEM$ would contain the Dell branding info.