Please help 400 error

I have uninstalled and reinstalled game three times now and all i keep getting when trying to launch is" system error 400 Http://frontier.ffxiv.com/arr_win/in...?rc_lang=en_us. on a black screen. Other times it will ask about a certificate saying the certificates dont match and won't open. this has been happening for 10+ hour a day the last 4 days and i can barely log in for 30-40 minutes before i get dced due to 90000 or runtime error. i have sent tickets in tried the phone number tried reinstalling i dont know what else to do. the game is now totally unplayable for me and square enix is unreachable.

You might have better luck with getting help if you posted in the "Technical Support" part of the forum.
http://forum.square-enix.com/ffxiv/forums/627

Ive tried but its so cluttered up there. and each reinstall just to play for 30 minutes is taking 5-6 hours. I tried looking the error up but nothing. Cleaned pc out nothing and if i try going directly to the http i posted it says invalid url. This happens all day long and then sometimes just magically disappears only to come back when i get dced