Is it safe to delete the Sandbox folder from C: drive (tried looking for answer, failed :( )

I'm giving this computer to a friend and instead of doing a complete wipe since they use a lot of the programs, I got rid of some things including Sandboxie. I saw that the Sandbox folder was taking up several gigs of hard drive space (over 100 gigs) I noticed it deleting familiar folders, I stopped it.

Is it actually safe to delete that folder completely? I want to say yes, but it's always best to ask just to make sure!