Question: What is autoexec.bak? What does this file do on my computer?

The IT Guy says:
Autoexec.bat is a "batch" file that executes a series of commands when your Windows-based computer is started up initially. Autoexec.bak may be a backup version of this file that was saved automatically by your operating system. Depending on the OS you are using, you also may have backup copies of this file named "autoexec.old" or "autoexec.000".

The main function of these backup files would be to use them if your current autoexec.bat file becomes corrupted or causes problems. You can delete or rename the current autoexec.bat file, rename one of these backup files "autoexec.bat" and then restart your computer, so the backup version of the file will be used.

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