Please be aware with Windows server we only provide the trial version, and if you want to use it beyond the trial you will need to purchase your own license.
Also, windows server will not work on the $4 mercury VPS because of insufficient resources. You're going to have to buy a larger VPS to run windows. The bare minimum that would be recommended is 2 CPUs and 2GB of memory, and I would recommend 4GB as 2 is not enough for windows to really function.
Do you still want to proceed with the rebuild?