Windows help?? gaming computer builder

Recently I acquired a Windows 7 Dell desktop from my school because they were scrapping a bunch of them to make room for new ones. I brought it home and hooked it up to a monitor and BOOM it worked! But here's the catch: it still asks for my school credentials to log in and I only have Bluetooth keyboards at home. Therefore, I can't boot into the BIOS to factory reset it. Is there any other way I can reset it WITHOUT a keyboard? Should I buy a wired keyboard? Will that even fix my problem? Thanks in advance

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