This isn't tested, and I am not home atm. but I use the process close function attached to hotkeys on many scripts on my pooter.
If ProcessExist ( 'hyperspin.exe' ) Process, Close, hyperspin. Anyhoo.you can create an ahk converted to exe to run when closing HS. Sorry, i know I am a little late in replying. Another thing I suggest which may or may not be the issue, uninstall and instance of 'Java' from your machine, from the add/remove list of programs. Only thing I would suggest if you haven't tried already is re-download Hyperspin 1.5.1 place it for now on the desktop and running that fresh. I do have it running as administrator from the. I'm current with my Windows updates constantly and never had a problem with running HS.
I noticed that sometimes when I go to Task Manager an instance of Hyperspin or sometimes a couple Hyperspin are running in the background, even sometimes HyperHQ if I've been working with that keep HS from launching.