Nets full or half, proper curtainsk? what ever, self tap screws are required. Don't use the wood screws provided, get the same size in self tap.
Silly not worrying about the warranty I assume you've never had a window replaced, it's expensive. But then again most warranties only cover manufacturing faults not accidental damage. In any case check your house insurance you may be covered anyway.
LOOK AROUND.
Have a look around first and ask in DIY shops that sell conservatories about the type of curtains and rods you want,
they may have the very ones you are looking for.
My better half wanted half nets 'top hung' French style I said to her don't get the long lightweight rods get two for each side of short ones and the ones with the 'L' shaped screw hooks not the stick on ones they are a waste of time as they drop off when it's hot.
I drilled a half mm hole for the screw hooks, hurts your fingers but they have to be tight being that your screwing into thin plastic not solid wood.
If you want proper curtains then you can use the normal track but again use self tap screws the same size as the wood screws provided.
If you're doing it I suggest you get a piece of plastic to drill so you can test the size of hole you drill is going to be the correct one [I did and I'm a veteran DIYer and still do test drilling it's easier than filling in an oversized hole].
However if you drill one to big stick a plastic plug in the hole, type you use for wood screws, that usually cures the problem of oversize holes.
With conventional tracking and using self tap screws drill the hole then screw in the self tap screw without the braket. the screw will cut a thread into the plastic, remove the screw, it wil be easier. Do this with each bracket screw and when you finaly screw the brackets in place the screws with go in easier having already cut the thread.
Good luck anyway. Bob
Bob, September 2005