Virgin are one of four new entrants joining F1 next season, along with US F1, Campos and Lotus F1.
Windsor, who is US F1's co-owner with former Ligier technical director Ken Anderson, insisted his team were also on track.
As part of the agreement, existing teams must help new outfits - Campos, US F1 and Manor - with their engines and chassis.
Those left at the meeting were current teams Williams and Force India and the three new teams - Manor, US F1 and Campos.
Ecclestone told the Times that he did not expect either US F1 or Campos Meta to be on the starting grid in March.
Next season's grid will be expanded after US F1, Campos, Virgin Racing and Lotus F1 were all ratified as new entrants in September.
There remain vacancies at new teams US F1 and Campos, but both are understood to require drivers to bring sponsorship, while Kubica commands a multi-million pound salary.
"I think the people we expected to perform will and those that we thought wouldn't, won't, " Ecclestone told the Times, which reported his doubts were focused on Campos and US F1.
Stefan GP's case is being championed by F1 boss Bernie Ecclestone, who has repeatedly been quoted saying he does not expect Campos or fellow new entrant US F1 to make the grid.
BBC: Adrian Campos 'working hard' to secure F1 team's future
Currently only five teams have committed to racing in next season's championship: Williams and Force India, who were expelled from FOTA for agreeing to participate, and new teams Campos GP, Manor F1 and Team US F1.
When the following year's race only drew 18, 500 spectators, F1 and the US parted ways.
So we asked our friends at the Sauber F1 Team to help us out.
Bourdais moved to the US after failing to win an F1 drive despite winning the Formula 3000 title in 2002.
At the same time it might help by boosting F1 awareness in the US, with Austin remaining the only purpose-built track.
As we enjoy our first F1 action in the US since 2007 we're glad that it's in HD this time, however it still falling short in one area -- in-car camera shots.
ENGADGET: Formula 1's on-board cameras may switch to HD next season HD
In 2009 Mr Ecclestone announced there was no plan for F1 to return to the US. But in May 2010 the race was awarded to Austin, with Mr Ecclestone and race promoter Tavo Hellmund agreeing a deal.
He blames bad marketing for many of F1's mishaps in the US. He's confident social media and the internet will result in more Americans appreciating European-style racing.
"Heikki has six years of F1 experience behind him so he is perfectly placed to provide us objective feedback on the various types of configurations we will run and to give us an objective view of the 2013 tires against his experience with the 2012 compounds, " Abiteboul explained.
The Business newspaper reported at the weekend that BSkyB chief executive James Murdoch had told a consortium of US and British private equity firms that he was open to playing a role in any F1 bid.
BBC: Ecclestone is trying to secure the future of F1 beyond 2007
Sato is Japan's most successful F1 driver, scoring 44 points from 90 races and taking third at the 2004 US Grand Prix.
Las Vegas, Detroit, Dallas and Phoenix all hosted F1 races in the intervening years, before Indianapolis, renowned for the Indy 500, became regular US hosts from 2000.
BBC: Formula 1 to make US return at new Austin track in 2012
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