System Recovery 2013 couldn't see C: to backup

I did download System Recovery 2013 on symantec website, try to boot System Recovery 2013 on HP DL 380p G8(Installed Windows 2008 R2), take a backup but unforternaterly for me, the System Recovery 2013 doesn't appear System C:, they only display System reserved 100MB

Please help us to slove the problem

Thanks,