The PERC 4/DC is not supported in 2008R2 ... no suitable driver exists, either from Dell or LSI.  You will need to upgrade to a PERC 4e/DC or some other controller to go to 2008R2.  I think I've read something about someone getting it working anyway, but some modifications, I'm sure, would have been necessary, so I couldn't comment on the system's stability.
Hello,first sorry for my bad English. I have a problem when installing windows server 2008 r2 on a poweredge 1800 server. I do the pre-install with "Dell Systems Management Tools and Documentation, v.6.5.0, A01" and when the server reboot, I get an error "can not find script file C: \ remindpopu2.vbs". I had read that rewrite the iso slow down can resolve this problem but I tried it and it didn't work. Any solutions? Tanks for future answers.
remindpopup2 error with poweredge 1800