Posting as a guest because a google search for fsx error 1722 lead me here. I thought I would help everyone having as much frustration as I am!
I havn't quite beat error 1722, but I'm close and found a semi-solution!
I tried reinstalling windows installer and a buncha other things msxml w/e it is, nothing works. The game oringally installed fine, but i crashed and it wouldnt recognize my activation and it said to reinstall. This is where most people encountered that it won't let you reinstall and you get error 1722 and a roll back!
Here is my solution:
When it gives you error 1722, don't click anything! Leave the error 1722 window up, I tried to ctrl alt delete the install to prevent rollback since it installs all the files for the game... it just wants to delete them when you're done. So I instead with my laptop unplugged it and popped the battery out. Re-powered it and presto it works! It prevented rollback! I can go into the FSX directory and start the game, BUT!
It still gives you the activation error b/s where it first told you to reinstall that lead you to error 1722. I can get the game started... although I don't know how to get around that activation thing. I am stuck without multiplayer or alot of things 😞 but at least I can play. I don't understand how i bought the game and paid 50 bucks for a demo... Does anyone know how to get it reactivated past this point in return for helping defeat the 1722? lol
Chief Captain
Trainee