I couldn't find that info re: "entry guard" anywhere in my version of 7.5.6. Believe me, I looked.
Long story short, I installed an older version, Tor 5, into another directory. I found it had a different entry point than my 7.6 version.
I then installed two more 7.6 Tors into directories of their own. Each worked and had different entry points. I now have four versions of Tor, each with a different "entry guard" point. In other words, I now have a choice of four separate entry points depending which copy of Tor I choose to use.
I'm not giving up on XP because I have many utilities and programs that do not work on Windows 7. As far as ever "upgrading" to Win 10, I'll go Mac first.