Id like to fire it up again just to get the pumps and fluid moving inside, but i doubt it would work with any of the currrent versions of BTC miners or windows. And im not sure of the older miners that support the Monarchs will work with the current forks of BTC.
CGMiner will work just fine, UNLESS, your unit has the latest firmware which was made to explicitly to break functionality with CGMiner. If so then you would need the old hacked version of BFG Miner.
You should be able to mine any Sha256 coin with it.
It will use an atrocious amount of electricity. You would be better off getting the Gekko Science R606 which will surpass the Monarch in performance but use only around 100 Watts. You would loose allot less money in electricity and have allot less noise.