Computer restored, now keyboard and mouse not working

Please help. I have an old Dell Desktop that i use for browsing and streaming. I recently hard an error and from browsing the Web i decided that a full restore was required. I have completed the full restore, which seems to have been successful, but i am now stuck on the "Hi There" screen where you need to fill in your country, what type of keyboard set you want etc. My problem is, in this screen, my mouse or keyboard will not work, I have tried 3 different keyboards and none of them will function, in order for me to get past the set up screen. They will work in the BIOS and i have looked at all the settings in there to see if i can force power to the USB's etc, but nothing works. Does anyone have any ideas? It has been suggested to try an old style keyboard mouse, (The round connections) but i do not have that option on the computer.

I have heard a suggestion of enabling the USB legacy option in the BIOS, but i cannot find this option anywhere, Can anyone help please? I beginning to think that the computer may be fit for the bin.

Many Thanks Mark