I'm afraid you'll have to get used to the many problems these cars have with the roof.
It's a constant worry whether it'll work or stop half way through.
I've had mine two and a half years and wish I'd never bought it.
The trouble is it's impossible to sell with a roof that isn't guaranteed to work - sometimes it does, sometimes it doesn't
But my god does it look good!
Try using the socket key & screwdriver in the manual lock within the boot - turning the key should lock the roof down and make the windows pop back up. At least that's the theory.
To open the boot when the roof's playing up you'll need to pull the emergency release in the box behind the passenger seat.
Somebody posted a good DIY fix for the hoop problem on here a few days ago if you search the threads. Mine was once taken off by the roof catching but it's been okay since it went into the dealer under warranty a few years ago.