Just wanted to potential new users to know there was a definitive bug in the new Win 7/8 version of SWARM, which causes SWARM's gpu auto-detect to fail.
Users are volunteering to pre-test the update via github master, which I believe resolves the issue. If it does, I will likely have a new release with a fix in a day or two. I appreciate your patience, however the Windows 10 version (original) should work without issue.
https://github.com/MaynardMiner/SWARM/issues/123