I have 10 characters and was playing in full screen mode, as far as I know. Game wouldn't load so, not knowing about this bug and assuming it was a corrupted file, I uninstalled the game and downloaded the installer. The installer downloaded fine, but will not run. I ran DXdiag, and it says I'm running DX12 with no issues. I tried adding the command line arguments with no luck. The only overlay I had was through Discord, which wasn't even running at the time. I turned that off. The installer still will not run.
Update: I turned my Microsoft Trend off and the installer ran. I didn't have to do that when I installed the game previously. The launcher is running the download. When it's done, I'll turn the antivirus back on and see if it runs then. @Fire Attunement.9835 So, I downloaded the game again, and ran it without an issue. Logged out, turned on my Trend Micro security, and the game would not start. I couldn't bring up Trend's main console, and Trend was acting bugged, so I restarted. Got the console up, added GW2 to Trend's exceptions list, and it would not start. Added the -perf and -windowed, not starting. Turned off Trend Micro, and the game works perfectly. There's some kind of conflict between the anti-virus software and the launcher which was not a problem before. I didn't have GW2 in my exceptions list before.
Thanks to @Mirus.8059, added the entire GW2 folder to Trend's exception list, and now it seems to be working perfectly.