Win XP won't recognize Mega 2560

Works fine with Uno. I've tried everything I could find on the internet including this: https://forum.arduino.cc/index.php?topic=107098.0, which gives the following error:

Cannot Start This Hardware

There was an error installing this hardware:

Arduino Mega 2560 R3

This device cannot start. [Code 10]

When I plug it in, it is recognized as a new USB Device and then the Arduino Mega 2560. I go through the steps to install and it keeps failing. Each time, the COM Port numbers keep increasing.

I've been beating my head against the wall for days over this. Does anyone have any ideas?

Code 10 is certainly a driver issue.

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