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It's the windows registry editor.
U can use it to edit the registry.

Go to power settings in control panel and change sleep mode to any time u want.

Regedit edits your registry.

If your computer is running slow these may be the causes:
Hard disk drive is short on available disk space.
Several software programs have been installed/uninstalled leaving behind bad files and/or...

.tmp files aren't media files.
They are temporary files created by applications on your computer.

Download Malwarebytes at malwarebytes.org