You can use the /extract switch for DUP's or you can use the "hard drive" (ZPE) version.  Since you didn't say what version of 2008 you were installing, I went to the trouble of posting them all: 2008x64:[URL] 2008x86:[URL] 2008R2:[URL] 
I am installing a Windows Server 2008 OS on a new PowerEdge R420 and I need to install the drivers for the PERC H310 controllers but I cannot find the drivers as files only windows installer exe files or DUP which is useless since I still don't have a running OS. Can anyone please tell me where to find that driver or how to get around this problem? Thank you 
Dell PERC H310 Drivers