You have probably noticed that windows vista, server 2008 or windows 7 does not have the option to configure a full memory dump in the Startup and Recovery interface.
So how do you get it to perform the full memory dump?
Well you now need to do this by a registry key. Navigate in the registry to:
Change the value on CrashDumpEnabled to "1".
CrashDumpEnabled "2" = Kernal Memory Dump
CrashDumpEnabled "3" = Small Memory Dump
When you go back into Startup and Recovery it will now read as "Complete Memory Dump"