Ok...I'm a PC guy too, and I have an iPad that I updated to iOS 4 recently. The download took about 90 seconds (I have a 35 mb/s down plan).
It sounds like your issue really has nothing to do with the iPad. You're just getting a painfully slow download speed. It may indeed be that your router is broken and needs to be replaced but until you get a new one:
Do you have another computer you can connect to your router and see if you get the same slow speed? That would eliminate your PC being the culprit.
Try connecting to a different port on the router.
Try a different cable between your PC and the router. Could be a bad cable...or connector.
Try rebooting your ONT. Unplug it from the battery backup unit for 30 seconds or so and then reconnect it.
If none of that helps, you might try leaving your router powered off overnight. You'd likely have a new WAN IP when you boot it back up in the morning and that might help.
And if none of that helps....you may have to wait for that new router to arrive and when it doesn't help (I'm guessing it won't) you'll have to call tech support back. They could have to roll a truck to see if the problem isn't somewhere outside your house in their network.
Good luck.
