You can make a bootable USB with Windows Server 2008 R2 installation media and boot the R610 from the USB and install the OS onto a local HDD. If the R610 has DRAC Enterprise you can remote in over the network and mount an iso image of Windows Server 2008 R2 as well and install the OS onto a local HDD that way. You won't be able to mine Bitcoin with a R610 unless you're going to be connecting ASICs to it in some manner as CPU mining bitcoin is not profitable. Litecoin is generally mined with GPUs as well and the R610 does not accept GPUs.