Ok Guys,
A couple (stupid?) questions here -- hopefully, someone can shed a little insight (I'm fresh out of yellow chiclets

) at the moment.
First: On my Win 10 box, Tequila runs like a champ, and I've been playing
*very* happily (and nearly non-stop) since last Friday evening.
On the Tequila screen I understand the various choices (HC, HC-64, Beta-HC, Pchat etc.), but I don't know what the Safe Modes are, and how they differ from the regular modes. Any help on that?
Second: On my other PC's (Win XP boxes -- yes, I *know* -- upgrade them out of the stone age, yada, yada...

Eventually, they'll get replaced - just not yet), Tequila runs just fine, all the files are downloaded / verified successfully. When I try to run HC, it pukes -- msg: "We were unable to locate the game data files. it is likely that your installation is corrupt and needs to be repaired".
That happens on both XP boxes, and yet, the game runs perfectly fine when I choose HC - Safe Mode, again on both boxes. I've tried deleting the whole shebang and re-installing again, but the results are the same.
SO -- I'm trying to figure out what the underlying problem is, and / or, how I can "repair my installation", or whether running HC - Safe Mode is an acceptable approach for those machines.
Once again, any insight you guys have on this would be much appreciated. In the meanwhile, I think there are some Skuls that need a head-bashing, so I'm off to Paragon City!
Cheers,
4