it'll go through your system drive (usually C:\) and clean whatever fits its criteria with Program Files, Windows and the current user.
it only looks at non personal, left-over sort of crap, so if you think it'll remove half your Barracuda then I'll guess you don't do regular maintenance or there are a lot of Restore Points or Recycle Bin etc items to clean up.
do an Analyse and post a screen shot if you like and we'll give it a quick once-over for you.
and a belated welcome to the forums. <img alt=":)" data-emoticon="" height="20" src="<fileStore.core_Emoticons>/emoticons/default_smile.png" srcset="<fileStore.core_Emoticons>/emoticons/smile@2x.png 2x" title=":)" width="20"></p>