Hi Caroline,
Just one thought struck me, is the netgear router also a modem that you used for sky?
If so, you cannot use the router part with Virgins modem, you must obtain a seperate wireless and cable (cat 5 cable ethernet (RJ45)) router only, and connect this between Virgins modem and your pc.
Any make of wireless router should work, just make sure it is a router only, and does not contain a modem.
There is absolutely no need to connect your modem or router to the Virgin+ box, if you want to you can connect it, but you must connect using a usb lead and not the normal ethernet lead, so you would probably need to connect direct to pc or through a usb hub, I wouldn't even bother.
All these things can be obtained online, or from PC world shops ect. .