I'm in the same boat.

Like many others I've:

-Confirmed plenty of HDD space.
- Disabled firewall
- Disabled anti-virus
- Deleted patch folder

I've tried everything and am getting this same issue. I was never even in the beta to begin with and downloaded a release client about a month after release so I dunno where this beta crap is coming from. SE won't even seem to acknowledge that this is a problem. *HOW* can we even hope to fix this without their help at this point? I do not want to be forced to cancel my sub for this game but I will not continue to pay for a game that I cannot play.