New
#21
Do you remember what you were doing last on the pc when the issue occurred?
How about we start off with rescuing your data? Do you have anything important stored on them?
Please see this tutorial. Lots of options here:
Emergency Kit - save your files from a dead OS
This way you can retireve your data, and then factory restore your pcs to a factory state to get running again.
I would indeed either buy a new router or reset the old one using the reset button on the back of the router.
I also suggest turning off your modem temporarily until you get the new router or reset the old one.
Do you have any somewhat tech savvy friends? You could also call your isp to help you, but it would not be cheap.