We upgrading 2003 DCs to 2012 DCs. I was getting this error when running adprep from 2k3 DC server:
adprep.exe is not a valid Win32 application. All our DCs are 2003 servers
I was using 2012 DVD. Anyway, I found a workaround to run adprep on member server which is 2008 R2 and it worked!!! I am wondering if I need to run adprep /domainprep /gpprep on the Infrustructure master?? MS says that you have to but it also says that you have to run forestprep on the schema master and I didn’t have to run on the schema master as long as server was on the same domain as schema master.
Please advise if I can run adprep /domainprep /gpprep on the member 2008 server in the same domain that is NOT an infrastructure master.
Otherwise please let me know how to make this error disappear.