lightspeed,
I had the hal 5 and hal 6 working at the same time, I liked hal 5 and had a few versions going for experimentation. When I installed Hal 6 I didn't choose to use the hal 5 brain files so I had a new install, Hal 6 worked and the hal 5's worked.
Hal puts some files in the windows folders, the Hal install checks for these folders before it will install. I'd make a copy of the brain file and put it in a safe place, you could uninstall Hal 6, install hal 5, install Hal 6.1, register Hal 6.1 then copy the brain file back in and thay should both work. I got tired of talking to both versions of Hal and only use the 6.1 now.
Carl2