Computer malfunction

[SuperSlim]

Okay so somehow I contracted some type of spyware or something on my computer and now I can't open a bunch of my programs. Well pretty much they're all somehow converted to Microsoft Word so none of them are working. But my videos and I can still view pictures for some weird reason.

But well my question is could I possibly use some type of ... like isn't there some type of back up thing on the computer where it saves stuff like from a certain date so if things like this happen you could revert back to that date and get your computer going from there?

And if I can't do that then how else could I fix this issue?