I see what you meant now. Sorry, I was unfamiliar with that tool (must be new.)
The output of the tool lists all hidden folders (and optionally files too.) There's no hard rule for determining whether a given hidden file or folder ought to be hidden or whether it's malicious. Google and your antivirus will be able to help you here, but with hundreds of items that will take a while.
Generally, each hard drive will have at least 2 hidden folders and zero or more hidden files. The drive where Windows is installed will likely have several hundred hidden folders, mostly stored inside the main Windows folder, the Users (or Documents and Settings) folder, and the Program Files folder(s). Folders at the root of the drive that will always be hidden include the Boot folder (newer versions of Windows), the $Recycle.Bin folder, and the System Volume Information folder.