Wireless keeps getting kicked off when on video sites

Hello!

My problem seems to be that whenever I go to a video sites (sometimes even youtube) or I get on the Itunes store or download something, the wireless will get kicked off my laptop. I will them run a repair, but it will tell that either the problem cannot be fixed and/or to disconnect the router for 10 seconds. When I do, it will sometimes work perfectly again (unless I go to said video website) or it will say that I am connected to an unidentified network, but even then it will not let me on the internet. If the latter happens, I have to re-do the router thing again or turn off and on my wireless pick up slide. I have also tried to update my drivers for the wireless, but it says that windows says that it is already up to date.

This is a recent problem that started in May.

My laptop is only a year and a half old, and it's a Dell XPS. The router is a netgear. I am running Vista Ultimate 32 bit.

Thanks!