Knowing only the tiny bit of information you provided, it's impossible to tell you anything for sure.
The first thing I'd suggest is looking at that other PC and see if, by chance, there was a backup taken to that PC when whatever happened was done. If so, you might be able to use that as a source of restore.
Otherwise, if the files are truly gone from your device, then restore depends on having a data source, and that won't be your device itself...rather, you would need to use a prior backup that you have taken as the source of restore now. You can find full instructions via the link in my auto-sig on this post.
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Occam's Razor nearly always applies when troubleshooting technology issues!
New to the Community? Click here and also here for helpful guidance. Also please click here for additional helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions. If anyone has been helpful to you, please show your appreciation by clicking the button. Need a reference to BB10 OS/SR versions? Click here. Need a specific BB10 AutoLoader? Send me a private message.