Healthcare.gov, the error-riddled website where uninsured Americans are supposed to shop for health insurance, now works for “in the zone of 80 percent” of users, a White House official said today. That’s up from just 30 percent of users who were able to navigate through the entire site five weeks ago. Officials say the site can now support its original goal of 50,000 users, even though it failed to support even 200 to 300 concurrent users in tests a few days before launch. “While we still have work to do, we have made significant progress with Healthcare.gov working for the vast majority of users,” Jeff Zients, who is leading the effort to repair Healthcare.gov, told reporters on a press call today. The improvement is the result of more than 400 software fixes and hardware upgrades, including a significant hardware upgrade on Friday night that roughly doubled the site’s capacity.