Unhide.exe is a tool used to unhide (hence the name) your files that were previously hidden from a family of rouge anti-spyware programs. These programs make you believe you have a ton of errors on your system and in order to optimize/fix your system you need to purchase their program.
These programs typically hide all your files along with everything in your start menu. I’ve had many family/friends come to me saying all my files are missing. Everything on my Desktop, My Documents, and Start menu. All you need to do is run Malware Bytes followed by unhide.exe to remove and reveal your files again!