Hello April Ferguson,
The combination of an external keyboard failing completely while the internal keyboard skips input strongly suggests a conflict with input filtering settings or the chipset's USB controller stack, rather than a simple driver corruption. While you noted that Sticky Keys is off, the specific symptom of "skipping letters", where the system ignores brief or repeated keystrokes, is the hallmark behavior of Filter Keys, which is a distinct accessibility feature from Sticky Keys. It is highly probable that Filter Keys was toggled on (often by holding the Right Shift key for eight seconds), causing the internal keyboard to reject normal typing speeds. You need to explicitly disable this by navigating to Settings > Accessibility > Keyboard (or Control Panel\Ease of Access\Ease of Access Center\Make the keyboard easier to use) and ensuring the Filter Keys toggle is set to Off. Furthermore, uncheck the box for "Allow the shortcut key to start Filter Keys" to prevent this from recurring.
Regarding the external keyboard being non-functional, since reinstalling the keyboard drivers in Device Manager did not work, the fault likely lies upstream in the USB or Chipset drivers which manage the data bus for both external and internal peripherals. Open Device Manager (devmgmt.msc), but instead of looking at Keyboards, expand the Universal Serial Bus controllers section. Right-click and select Uninstall device for every entry labeled USB Root Hub or Host Controller. Once the list is cleared, restart your laptop immediately. This forces Windows to reload the entire USB stack and Chipset interface during the boot sequence, which is necessary to fix port enumeration errors that standard driver updates often miss.
If the software reset does not restore functionality, you should perform a Hard Reset (EC Reset) to clear the laptop's Embedded Controller, which physically manages input signals. Shut down the laptop, disconnect the AC adapter and all peripherals, and if possible, remove the battery. Hold the power button down for a full 30 seconds to drain any residual flea power from the motherboard capacitors. Reconnect the power and boot up; this resets the hardware state of the I/O ports. If the keyboard works correctly in the BIOS or Safe Mode but fails in normal Windows, the issue is software-based; however, if the external keyboard remains dead and the internal skips even in the BIOS, you are likely dealing with a hardware failure on the motherboard's southbridge or I/O controller.
I hope you've found something useful here. If it helps you get more insight into the issue, it's appreciated to accept the answer. Should you have more questions, feel free to leave a message. Have a nice day!
VP