What is so hard about pushing the reset button on the back of the router and setting it back to the default settings?
Then unplug your modem and router for a few seconds...
Then plug in your modem until it initializes, then plug in your router.
*****
And as far as your £15 for your dongle, why didn't you just run your Ethernet cable directly from your modem to your computer to access the Internet?
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